diff --git a/src/interface/CMakeLists.txt b/src/interface/CMakeLists.txt
new file mode 100644
index 0000000000..5e43a3171b
--- /dev/null
+++ b/src/interface/CMakeLists.txt
@@ -0,0 +1,50 @@
+# This file was generated with the assistance of an AI coding tool.
+################################################################################
+#                                                                              #
+# This file is part of IfcOpenShell.                                           #
+#                                                                              #
+# IfcOpenShell is free software: you can redistribute it and/or modify         #
+# it under the terms of the Lesser GNU General Public License as published by  #
+# the Free Software Foundation, either version 3.0 of the License, or          #
+# (at your option) any later version.                                          #
+#                                                                              #
+# IfcOpenShell is distributed in the hope that it will be useful,              #
+# but WITHOUT ANY WARRANTY; without even the implied warranty of               #
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                 #
+# Lesser GNU General Public License for more details.                          #
+#                                                                              #
+# You should have received a copy of the Lesser GNU General Public License     #
+# along with this program. If not, see <http://www.gnu.org/licenses/>.         #
+#                                                                              #
+################################################################################
+
+message("Running CMakeLists.txt in /src/interface")
+
+set(QT_VERSION 6 CACHE STRING "Qt version")
+find_package(Qt${QT_VERSION} COMPONENTS Core Gui Widgets Svg REQUIRED PATHS ${QT_DIR})
+
+set(INTERFACE_FILES
+    ${CMAKE_CURRENT_SOURCE_DIR}/main.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/MockMainWindow.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/MockMainWindow.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/interface_resources.qrc
+)
+
+add_executable(IfcInterfaceMockup ${INTERFACE_FILES})
+
+set_target_properties(IfcInterfaceMockup PROPERTIES
+    AUTOMOC ON
+    AUTORCC ON
+    WIN32_EXECUTABLE ON
+    MACOSX_BUNDLE ON
+)
+
+target_link_libraries(IfcInterfaceMockup PRIVATE
+    IfcViewer
+    Qt${QT_VERSION}::Core
+    Qt${QT_VERSION}::Gui
+    Qt${QT_VERSION}::Svg
+    Qt${QT_VERSION}::Widgets
+)
+
+install(TARGETS IfcInterfaceMockup EXPORT ${IFCOPENSHELL_EXPORT_TARGETS})
diff --git a/src/interface/MockMainWindow.cpp b/src/interface/MockMainWindow.cpp
new file mode 100644
index 0000000000..85cefdd4ed
--- /dev/null
+++ b/src/interface/MockMainWindow.cpp
@@ -0,0 +1,1292 @@
+// This file was generated with the assistance of an AI coding tool.
+/********************************************************************************
+ *                                                                              *
+ * This file is part of IfcOpenShell.                                           *
+ *                                                                              *
+ * IfcOpenShell is free software: you can redistribute it and/or modify         *
+ * it under the terms of the Lesser GNU General Public License as published by  *
+ * the Free Software Foundation, either version 3.0 of the License, or          *
+ * (at your option) any later version.                                          *
+ *                                                                              *
+ * IfcOpenShell is distributed in the hope that it will be useful,              *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of               *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                 *
+ * Lesser GNU General Public License for more details.                          *
+ *                                                                              *
+ * You should have received a copy of the Lesser GNU General Public License     *
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.         *
+ *                                                                              *
+ ********************************************************************************/
+
+#include "MockMainWindow.h"
+
+#include "AppSettings.h"
+#include "SceneLoader.h"
+#include "ViewportWindow.h"
+
+#include <QDockWidget>
+#include <QFileDialog>
+#include <QFile>
+#include <QFormLayout>
+#include <QFrame>
+#include <QGroupBox>
+#include <QHeaderView>
+#include <QHBoxLayout>
+#include <QIcon>
+#include <QLabel>
+#include <QLineEdit>
+#include <QListWidget>
+#include <QMenu>
+#include <QMessageBox>
+#include <QPainter>
+#include <QPixmap>
+#include <QRegularExpression>
+#include <QScrollArea>
+#include <QSvgRenderer>
+#include <QSignalBlocker>
+#include <QStackedWidget>
+#include <QStatusBar>
+#include <QTableWidget>
+#include <QTabBar>
+#include <QToolButton>
+#include <QTreeWidget>
+#include <QVBoxLayout>
+
+namespace {
+
+QPixmap renderTintedSvgPixmap(const QString& icon_path, const QString& color, const QSize& size) {
+    QFile file(icon_path);
+    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
+        return QIcon(icon_path).pixmap(size);
+    }
+
+    QString svg = QString::fromUtf8(file.readAll());
+    QString tinted = svg;
+    tinted.replace("currentColor", color, Qt::CaseSensitive);
+    tinted.replace(QRegularExpression(R"(stroke="[^"]*")"), QString("stroke=\"%1\"").arg(color));
+    tinted.replace(QRegularExpression(R"(fill="none")"), "fill=\"none\"");
+    QByteArray data = tinted.toUtf8();
+    QSvgRenderer renderer(data);
+    QPixmap pixmap(size);
+    pixmap.fill(Qt::transparent);
+    QPainter painter(&pixmap);
+    renderer.render(&painter);
+    return pixmap;
+}
+
+QIcon makeTintedSvgIcon(const QString& icon_path, const QString& normal = "#39b54a",
+                        const QString& active = "#53c763", const QString& disabled = "#6f7988") {
+    QFile file(icon_path);
+    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
+        return QIcon(icon_path);
+    }
+
+    QIcon icon;
+    icon.addPixmap(renderTintedSvgPixmap(icon_path, normal, QSize(20, 20)), QIcon::Normal, QIcon::Off);
+    icon.addPixmap(renderTintedSvgPixmap(icon_path, active, QSize(20, 20)), QIcon::Active, QIcon::Off);
+    icon.addPixmap(renderTintedSvgPixmap(icon_path, active, QSize(20, 20)), QIcon::Selected, QIcon::Off);
+    icon.addPixmap(renderTintedSvgPixmap(icon_path, disabled, QSize(20, 20)), QIcon::Disabled, QIcon::Off);
+    return icon;
+}
+
+QIcon makePanelSvgIcon(const QString& icon_path) {
+    return makeTintedSvgIcon(icon_path, "#e7ebf2", "#ffffff", "#6f7988");
+}
+
+QPixmap makePanelSvgPixmap(const QString& icon_path, const QSize& size) {
+    return renderTintedSvgPixmap(icon_path, "#e7ebf2", size);
+}
+
+class DockTitleBar : public QWidget {
+public:
+    explicit DockTitleBar(const QString& title, bool has_settings = false, QWidget* parent = nullptr)
+        : QWidget(parent)
+    {
+        auto* layout = new QHBoxLayout(this);
+        layout->setContentsMargins(10, 6, 6, 6);
+        layout->setSpacing(6);
+
+        auto* text = new QLabel(title.toUpper(), this);
+        text->setObjectName("dockTitleText");
+
+        layout->addWidget(text);
+        layout->addStretch(1);
+        if (has_settings) {
+            auto* settings = new QToolButton(this);
+            settings->setIcon(makePanelSvgIcon(":/icons/settings.svg"));
+            settings->setAutoRaise(true);
+            settings->setCursor(Qt::ArrowCursor);
+            settings->setFixedSize(18, 18);
+            settings->setObjectName("dockTitleButton");
+            settings->setToolTip(QString("%1 settings").arg(title));
+            connect(settings, &QToolButton::clicked, this, [this, title]() {
+                auto* anchor = parentWidget();
+                QMenu menu(anchor);
+                menu.addAction(QString("%1 settings coming soon").arg(title));
+                menu.exec(QCursor::pos());
+            });
+            layout->addWidget(settings);
+        }
+    }
+};
+
+QDockWidget* makeDock(const QString& title, QWidget* content, QWidget* parent, bool has_settings = false) {
+    auto* dock = new QDockWidget(title, parent);
+    dock->setObjectName(title);
+    dock->setFeatures(QDockWidget::DockWidgetMovable |
+                      QDockWidget::DockWidgetFloatable |
+                      QDockWidget::DockWidgetClosable);
+    dock->setTitleBarWidget(new DockTitleBar(title, has_settings, dock));
+    dock->setWidget(content);
+    return dock;
+}
+
+QFrame* wrapPanel(QWidget* inner) {
+    auto* outer = new QFrame();
+    auto* outer_layout = new QVBoxLayout(outer);
+    outer_layout->setContentsMargins(6, 6, 6, 6);
+    outer_layout->setSpacing(0);
+
+    auto* frame = new QFrame(outer);
+    frame->setObjectName("panelFrame");
+    auto* layout = new QVBoxLayout(frame);
+    layout->setContentsMargins(8, 8, 8, 8);
+    layout->setSpacing(0);
+    layout->addWidget(inner);
+
+    outer_layout->addWidget(frame);
+    return outer;
+}
+
+QFrame* wrapInspectorPanel(QWidget* inner) {
+    auto* outer = new QFrame();
+    auto* outer_layout = new QVBoxLayout(outer);
+    outer_layout->setContentsMargins(6, 6, 6, 6);
+    outer_layout->setSpacing(0);
+
+    auto* frame = new QFrame(outer);
+    frame->setObjectName("panelFrame");
+    auto* layout = new QVBoxLayout(frame);
+    layout->setContentsMargins(0, 8, 0, 8);
+    layout->setSpacing(0);
+    layout->addWidget(inner);
+
+    outer_layout->addWidget(frame);
+    return outer;
+}
+
+QWidget* makeInspectorFilterField(const QString& placeholder, QWidget* parent = nullptr) {
+    auto* field = new QLineEdit(parent);
+    field->setPlaceholderText(placeholder);
+    field->setClearButtonEnabled(true);
+    field->addAction(makePanelSvgIcon(":/icons/filter.svg"), QLineEdit::LeadingPosition);
+    return field;
+}
+
+QWidget* makePropertySetPanel(const QString& title,
+                              const QList<QPair<QString, QString>>& rows,
+                              QWidget* parent = nullptr) {
+    auto* group = new QGroupBox(title, parent);
+    group->setObjectName("propertySetCard");
+    auto* form = new QFormLayout(group);
+    form->setContentsMargins(10, 10, 10, 10);
+    form->setHorizontalSpacing(16);
+    form->setVerticalSpacing(6);
+    form->setFieldGrowthPolicy(QFormLayout::AllNonFixedFieldsGrow);
+
+    for (const auto& [name, value] : rows) {
+        auto* key = new QLabel(name, group);
+        key->setObjectName("propertyKeyLabel");
+        auto* val = new QLabel(value, group);
+        val->setObjectName("propertyValueLabel");
+        val->setWordWrap(true);
+        form->addRow(key, val);
+    }
+
+    return group;
+}
+
+QWidget* makeInspectorSection(const QString& title,
+                              const QString& filter_placeholder,
+                              const QList<QWidget*>& groups,
+                              QWidget* parent = nullptr) {
+    auto* section = new QWidget(parent);
+    section->setObjectName("inspectorSection");
+    auto* layout = new QVBoxLayout(section);
+    layout->setContentsMargins(0, 0, 0, 0);
+    layout->setSpacing(6);
+
+    auto* header = new QFrame(section);
+    header->setObjectName("inspectorSectionHeader");
+    auto* header_layout = new QHBoxLayout(header);
+    header_layout->setContentsMargins(0, 0, 0, 0);
+    header_layout->setSpacing(6);
+
+    auto* toggle = new QToolButton(header);
+    toggle->setObjectName("inspectorSectionButton");
+    toggle->setText(title);
+    toggle->setCheckable(true);
+    toggle->setChecked(true);
+    toggle->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
+    toggle->setArrowType(Qt::DownArrow);
+    header_layout->addWidget(toggle);
+    header_layout->addStretch(1);
+
+    QLineEdit* filter_field = nullptr;
+    if (!filter_placeholder.isEmpty()) {
+        auto* filter_toggle = new QToolButton(header);
+        filter_toggle->setObjectName("inspectorFilterToggle");
+        filter_toggle->setCheckable(true);
+        filter_toggle->setChecked(false);
+        filter_toggle->setIcon(makePanelSvgIcon(":/icons/filter.svg"));
+        filter_toggle->setAutoRaise(true);
+        filter_toggle->setToolTip(QString("Filter %1").arg(title.toLower()));
+        header_layout->addWidget(filter_toggle);
+
+        filter_field = qobject_cast<QLineEdit*>(makeInspectorFilterField(filter_placeholder, section));
+        filter_field->setVisible(false);
+        QObject::connect(filter_toggle, &QToolButton::toggled, filter_field, [filter_field](bool visible) {
+            filter_field->setVisible(visible);
+            if (visible) filter_field->setFocus();
+        });
+    }
+
+    auto* body = new QWidget(section);
+    body->setObjectName("inspectorSectionBody");
+    auto* body_layout = new QVBoxLayout(body);
+    body_layout->setContentsMargins(10, 6, 10, 0);
+    body_layout->setSpacing(6);
+    for (auto* group : groups) body_layout->addWidget(group);
+
+    QObject::connect(toggle, &QToolButton::toggled, body, [toggle, body](bool expanded) {
+        toggle->setArrowType(expanded ? Qt::DownArrow : Qt::RightArrow);
+        body->setVisible(expanded);
+    });
+
+    layout->addWidget(header);
+    if (filter_field) {
+        auto* filter_wrapper = new QWidget(section);
+        filter_wrapper->setObjectName("inspectorFilterWrapper");
+        auto* filter_wrapper_layout = new QVBoxLayout(filter_wrapper);
+        filter_wrapper_layout->setContentsMargins(10, 0, 10, 0);
+        filter_wrapper_layout->setSpacing(0);
+        filter_wrapper_layout->addWidget(filter_field);
+        layout->addWidget(filter_wrapper);
+    }
+    layout->addWidget(body);
+    return section;
+}
+
+QWidget* makeAttributeList(const QList<QPair<QString, QString>>& rows, QWidget* parent = nullptr) {
+    auto* panel = new QWidget(parent);
+    panel->setObjectName("attributeList");
+    auto* form = new QFormLayout(panel);
+    form->setContentsMargins(0, 0, 0, 0);
+    form->setHorizontalSpacing(16);
+    form->setVerticalSpacing(6);
+    form->setFieldGrowthPolicy(QFormLayout::AllNonFixedFieldsGrow);
+
+    for (const auto& [name, value] : rows) {
+        auto* key = new QLabel(name, panel);
+        key->setObjectName("propertyKeyLabel");
+        auto* val = new QLabel(value, panel);
+        val->setObjectName("propertyValueLabel");
+        val->setWordWrap(true);
+        form->addRow(key, val);
+    }
+
+    return panel;
+}
+
+QWidget* makeRelationshipList(const QList<QPair<QString, QString>>& rows, QWidget* parent = nullptr) {
+    auto* panel = new QWidget(parent);
+    panel->setObjectName("attributeList");
+    auto* layout = new QVBoxLayout(panel);
+    layout->setContentsMargins(0, 0, 0, 0);
+    layout->setSpacing(6);
+
+    for (const auto& [name, value] : rows) {
+        auto* row = new QWidget(panel);
+        row->setObjectName("relationshipRow");
+        auto* row_layout = new QHBoxLayout(row);
+        row_layout->setContentsMargins(0, 0, 0, 0);
+        row_layout->setSpacing(12);
+
+        auto* key = new QLabel(name, row);
+        key->setObjectName("propertyKeyLabel");
+        key->setMinimumWidth(72);
+
+        auto* target = new QLabel(value, row);
+        target->setObjectName("relationshipValueLabel");
+        target->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
+
+        auto* icon = new QLabel(row);
+        icon->setObjectName("relationshipIconLabel");
+        icon->setPixmap(makePanelSvgPixmap(":/icons/cursor-pointer.svg", QSize(14, 14)));
+        icon->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
+
+        row_layout->addWidget(key);
+        row_layout->addWidget(target, 1);
+        row_layout->addWidget(icon, 0, Qt::AlignRight | Qt::AlignVCenter);
+        layout->addWidget(row);
+    }
+
+    return panel;
+}
+
+} // namespace
+
+MockMainWindow::MockMainWindow(QWidget* parent)
+    : QMainWindow(parent)
+{
+    setupChrome();
+    setupViewport();
+    setupDocks();
+    setupStatus();
+    setupLoader();
+    setupRibbon();
+    resize(1720, 980);
+}
+
+void MockMainWindow::setupChrome() {
+    setWindowTitle("IfcOpenShell Interface");
+    setDockOptions(QMainWindow::AllowNestedDocks |
+                   QMainWindow::AllowTabbedDocks |
+                   QMainWindow::GroupedDragging);
+
+    setStyleSheet(R"(
+        QMainWindow {
+            background: #26292f;
+        }
+        QWidget {
+            color: #d0d5dd;
+            background: #26292f;
+            selection-background-color: #39b54a;
+            selection-color: #14161a;
+        }
+        QFrame#ribbonShell {
+            background: #2d3138;
+            border-bottom: 1px solid #1b1d22;
+        }
+        QTabBar::tab {
+            background: transparent;
+            color: #8d97a7;
+            padding: 8px 14px;
+            margin-right: 2px;
+            border-bottom: 2px solid transparent;
+        }
+        QTabBar::tab:selected {
+            color: #f2f5fa;
+            border-bottom: 2px solid #39b54a;
+        }
+        QTabBar::tab:hover {
+            color: #ffffff;
+        }
+        QFrame#ribbonBand {
+            background: #31353d;
+            border-top: 1px solid #3b4048;
+        }
+        QFrame#ribbonPage {
+            background: transparent;
+        }
+        QFrame#ribbonGroup {
+            background: transparent;
+            border-right: 1px solid #434852;
+        }
+        QLabel#ribbonGroupLabel {
+            color: #7f8796;
+            font-size: 9px;
+            font-weight: 600;
+            letter-spacing: 0.08em;
+        }
+        QToolButton#ribbonButton {
+            background: transparent;
+            border: none;
+            padding: 6px 4px 4px 4px;
+            font-size: 11px;
+            color: #d6dce6;
+        }
+        QToolButton#ribbonButton:hover {
+            background: #3a3f48;
+        }
+        QToolButton#ribbonButton:pressed {
+            background: #24282f;
+        }
+        QFrame#viewportShell {
+            background: #202329;
+            border-top: 1px solid #1d2025;
+        }
+        QFrame#viewportFrame {
+            background: #1a1d22;
+            border: 1px solid #333942;
+        }
+        QDockWidget {
+            color: #d0d5dd;
+        }
+        QLabel#dockTitleText {
+            color: #dfe4ec;
+            font-size: 10px;
+            font-weight: 700;
+            letter-spacing: 0.08em;
+        }
+        QToolButton#dockTitleButton {
+            color: #8e97a5;
+            border: none;
+            background: transparent;
+        }
+        QToolButton#dockTitleButton:hover {
+            color: #ffffff;
+            background: #353a42;
+        }
+        QFrame#panelFrame {
+            background: #2b2f36;
+            border: 1px solid #3e444e;
+            border-radius: 3px;
+        }
+        QTreeWidget, QListWidget, QTableWidget, QAbstractScrollArea {
+            background: #2b2f36;
+            border: none;
+            outline: none;
+            gridline-color: #333842;
+        }
+        QTreeWidget::viewport, QListWidget::viewport, QTableWidget::viewport {
+            background: #2b2f36;
+        }
+        QHeaderView::section {
+            background: #31353d;
+            color: #b5becc;
+            border: none;
+            border-bottom: 1px solid #434a55;
+            padding: 7px 8px;
+            font-weight: 600;
+        }
+        QTableCornerButton::section {
+            background: #31353d;
+            border: none;
+        }
+        QScrollArea {
+            background: #2b2f36;
+            border: none;
+        }
+        QScrollArea > QWidget > QWidget {
+            background: #2b2f36;
+        }
+        QLineEdit {
+            background: #31353d;
+            border: 1px solid #434a55;
+            border-radius: 3px;
+            padding: 6px 8px;
+            color: #d9dfeb;
+        }
+        QLineEdit:focus {
+            border: 1px solid #5b6472;
+        }
+        QFrame#entityClassCard {
+            background: #26292f;
+            border: 1px solid #404650;
+            border-radius: 3px;
+        }
+        QLabel#entityClassLabel {
+            color: #eef2f8;
+            font-weight: 700;
+            background: transparent;
+        }
+        QLabel#entityTypeLabel {
+            color: #9aa4b3;
+            background: transparent;
+        }
+        QWidget#attributeList {
+            background: transparent;
+        }
+        QTreeView::item, QListView::item, QTableView::item {
+            padding: 4px;
+        }
+        QScrollBar:vertical {
+            background: transparent;
+            width: 10px;
+            margin: 2px 2px 2px 0;
+        }
+        QScrollBar:horizontal {
+            background: transparent;
+            height: 10px;
+            margin: 0 2px 2px 2px;
+        }
+        QScrollBar::handle:vertical, QScrollBar::handle:horizontal {
+            background: #525a67;
+            border-radius: 3px;
+            min-height: 24px;
+            min-width: 24px;
+        }
+        QScrollBar::handle:vertical:hover, QScrollBar::handle:horizontal:hover {
+            background: #697385;
+        }
+        QScrollBar::add-line, QScrollBar::sub-line,
+        QScrollBar::add-page, QScrollBar::sub-page {
+            background: transparent;
+            border: none;
+        }
+        QStatusBar {
+            background: #24272c;
+            border-top: 1px solid #1a1c20;
+        }
+        QStatusBar QLabel {
+            color: #97a1af;
+            background: transparent;
+            border: none;
+            padding: 2px 8px;
+        }
+        QGroupBox {
+            background: transparent;
+            border: 1px solid #404650;
+            border-radius: 3px;
+            margin-top: 10px;
+            padding-top: 10px;
+        }
+        QGroupBox#propertySetCard {
+            background: #26292f;
+            border: 1px solid #404650;
+            border-radius: 3px;
+        }
+        QGroupBox#propertySetCard::title {
+            subcontrol-origin: margin;
+            left: 10px;
+            padding: 0 4px;
+            color: #d5dbe5;
+        }
+        QGroupBox#propertySetCard > QWidget {
+            background: #26292f;
+        }
+        QWidget#inspectorSection {
+            background: transparent;
+        }
+        QWidget#inspectorFilterWrapper {
+            background: transparent;
+        }
+        QWidget#relationshipRow {
+            background: transparent;
+        }
+        QLabel#relationshipIconLabel {
+            background: transparent;
+        }
+        QWidget#inspectorPanel {
+            background: #2b2f36;
+        }
+        QToolButton#inspectorSectionButton {
+            background: transparent;
+            border: none;
+            color: #e1e7f0;
+            font-weight: 700;
+            text-align: left;
+            padding: 2px;
+            margin: 0;
+        }
+        QToolButton#inspectorSectionButton:hover {
+            color: #ffffff;
+        }
+        QToolButton#inspectorSectionButton::menu-indicator {
+            image: none;
+            width: 0;
+        }
+        QFrame#inspectorSectionHeader {
+            background: #26292f;
+        }
+        QToolButton#inspectorFilterToggle {
+            background: transparent;
+            border: none;
+            padding: 2px;
+        }
+        QToolButton#inspectorFilterToggle:hover {
+            background: #353a42;
+        }
+        QWidget#inspectorSectionBody {
+            background: transparent;
+        }
+        QLabel#propertyKeyLabel {
+            color: #9aa4b3;
+            background: transparent;
+        }
+        QLabel#propertyValueLabel {
+            color: #dce2eb;
+            background: transparent;
+        }
+        QLabel#relationshipValueLabel {
+            color: #dce2eb;
+            background: transparent;
+        }
+    )");
+}
+
+QToolButton* MockMainWindow::makeRibbonAction(const QString& text, const QString& icon_path) {
+    auto* button = new QToolButton(this);
+    button->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
+    button->setIcon(icon_path.endsWith(".svg")
+        ? makeTintedSvgIcon(icon_path)
+        : QIcon(icon_path));
+    button->setIconSize(QSize(20, 20));
+    button->setText(text);
+    button->setMinimumSize(QSize(68, 54));
+    button->setObjectName("ribbonButton");
+    button->setAutoRaise(false);
+    return button;
+}
+
+QWidget* MockMainWindow::makeRibbonGroup(const QString& title, const QList<QToolButton*>& buttons) {
+    auto* group = new QFrame(this);
+    group->setObjectName("ribbonGroup");
+    auto* group_layout = new QVBoxLayout(group);
+    group_layout->setContentsMargins(8, 6, 8, 4);
+    group_layout->setSpacing(4);
+    auto* button_row = new QHBoxLayout();
+    button_row->setContentsMargins(0, 0, 0, 0);
+    button_row->setSpacing(4);
+    for (auto* button : buttons) {
+        button_row->addWidget(button);
+    }
+    auto* label = new QLabel(title, group);
+    label->setObjectName("ribbonGroupLabel");
+    label->setAlignment(Qt::AlignCenter);
+    group_layout->addLayout(button_row);
+    group_layout->addWidget(label);
+    return group;
+}
+
+QWidget* MockMainWindow::makeComingSoonPanel(const QString& title) {
+    auto* widget = new QWidget(this);
+    auto* layout = new QVBoxLayout(widget);
+    layout->setContentsMargins(12, 12, 12, 12);
+    auto* heading = new QLabel(title, widget);
+    heading->setStyleSheet("font-size:14px; font-weight:600; color:#e1e6ee;");
+    auto* body = new QLabel("Coming soon", widget);
+    body->setAlignment(Qt::AlignCenter);
+    body->setStyleSheet("color:#8f98a6;");
+    layout->addWidget(heading);
+    layout->addStretch(1);
+    layout->addWidget(body);
+    layout->addStretch(1);
+    return widget;
+}
+
+void MockMainWindow::setStatusMessage(const QString& mode, const QString& detail) {
+    status_mode_label_->setText(mode);
+    status_selection_label_->setText(detail);
+}
+
+QToolButton* MockMainWindow::makePanelToggle(const QString& text, QDockWidget* dock) {
+    auto* button = makeRibbonAction(text, ":/icons/dm_toggle_openings.png");
+    button->setCheckable(true);
+    button->setChecked(dock->isVisible());
+    connect(button, &QToolButton::toggled, dock, [dock](bool checked) {
+        dock->setVisible(checked);
+        if (checked) dock->raise();
+    });
+    connect(dock, &QDockWidget::visibilityChanged, button, [button](bool visible) {
+        const QSignalBlocker blocker(button);
+        button->setChecked(visible);
+    });
+    return button;
+}
+
+QWidget* MockMainWindow::buildHomeRibbonPage() {
+    auto* page = new QFrame(this);
+    page->setObjectName("ribbonPage");
+    auto* row = new QHBoxLayout(page);
+    row->setContentsMargins(6, 4, 6, 4);
+    row->setSpacing(0);
+
+    auto* new_project = makeRibbonAction("New Project", ":/icons/plus-square.svg");
+    connect(new_project, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Project", "New Project coming soon");
+    });
+    auto* open_project = makeRibbonAction("Open Project", ":/icons/download-square.svg");
+    connect(open_project, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Project", "Open Project coming soon");
+    });
+    auto* open_cloud = makeRibbonAction("Open Cloud", ":/icons/cloud-square.svg");
+    connect(open_cloud, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Project", "Open Cloud Project coming soon");
+    });
+    auto* open_recent = makeRibbonAction("Open Recent", ":/icons/clock-rotate-right.svg");
+    connect(open_recent, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Project", "Open Recent coming soon");
+    });
+    auto* save_project = makeRibbonAction("Save Project", ":/icons/floppy-disk.svg");
+    connect(save_project, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Project", "Save Project coming soon");
+    });
+    auto* save_project_as = makeRibbonAction("Save As", ":/icons/floppy-disk-arrow-in.svg");
+    connect(save_project_as, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Project", "Save Project As coming soon");
+    });
+
+    auto* add_model = makeRibbonAction("Add Model", ":/icons/cube.svg");
+    connect(add_model, &QToolButton::clicked, this, &MockMainWindow::onAddFiles);
+    auto* sync_models = makeRibbonAction("Sync Models", ":/icons/refresh-double.svg");
+    connect(sync_models, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Models", "Sync models coming soon");
+    });
+
+    auto* settings_button = makeRibbonAction("Settings", ":/icons/settings.svg");
+    connect(settings_button, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Settings", "Settings coming soon");
+    });
+
+    row->addWidget(makeRibbonGroup("PROJECT", {new_project, open_project, open_cloud, open_recent, save_project, save_project_as}));
+    row->addWidget(makeRibbonGroup("MODELS", {add_model, sync_models}));
+    row->addWidget(makeRibbonGroup("SETTINGS", {settings_button}));
+    row->addStretch(1);
+    return page;
+}
+
+QWidget* MockMainWindow::buildNavigateRibbonPage() {
+    auto* page = new QFrame(this);
+    page->setObjectName("ribbonPage");
+    auto* row = new QHBoxLayout(page);
+    row->setContentsMargins(2, 4, 2, 4);
+    row->setSpacing(0);
+
+    auto* set_home = makeRibbonAction("Set Home", ":/icons/home.svg");
+    connect(set_home, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Camera", "Set home view coming soon");
+    });
+    auto* go_home = makeRibbonAction("Go Home", ":/icons/home-alt.svg");
+    connect(go_home, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Camera", "Go to home view coming soon");
+    });
+    auto* view_all = makeRibbonAction("View All", ":/icons/cube-scan.svg");
+    connect(view_all, &QToolButton::clicked, this, [this]() {
+        if (viewport_) viewport_->viewAll();
+    });
+    auto* view_selected = makeRibbonAction("View Selected", ":/icons/cube-scan-solid.svg");
+    connect(view_selected, &QToolButton::clicked, this, [this]() {
+        if (viewport_) viewport_->focusOnSelectedObject();
+    });
+
+    auto* plan_view = makeRibbonAction("Plan", ":/icons/planimetry.svg");
+    connect(plan_view, &QToolButton::clicked, this, [this]() {
+        if (viewport_) viewport_->setStandardView(90.0f, 90.0f);
+    });
+    auto* front_view = makeRibbonAction("Front", ":/icons/city.svg");
+    connect(front_view, &QToolButton::clicked, this, [this]() {
+        if (viewport_) viewport_->setStandardView(0.0f, 0.0f);
+    });
+    auto* side_view = makeRibbonAction("Side", ":/icons/building.svg");
+    connect(side_view, &QToolButton::clicked, this, [this]() {
+        if (viewport_) viewport_->setStandardView(90.0f, 0.0f);
+    });
+    auto* align_object = makeRibbonAction("Align Object", ":/icons/cellar.svg");
+    connect(align_object, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Orientation", "Align to object coming soon");
+    });
+    auto* projection_button = makeRibbonAction("Perspective", ":/icons/perspective-view.svg");
+    connect(projection_button, &QToolButton::clicked, this, [this, projection_button]() {
+        if (!viewport_) return;
+        viewport_->toggleProjection();
+        projection_button->setText(viewport_->projectionOrtho() ? "Ortho" : "Perspective");
+    });
+
+    auto* orbit_mode = makeRibbonAction("Orbit", ":/icons/rotate-camera-right.svg");
+    connect(orbit_mode, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Mode", "Orbit mode active");
+    });
+    auto* fly_mode = makeRibbonAction("Fly", ":/icons/drone.svg");
+    connect(fly_mode, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Mode", "Fly mode coming soon");
+    });
+
+    row->addWidget(makeRibbonGroup("CAMERA", {set_home, go_home, view_all, view_selected}));
+    row->addWidget(makeRibbonGroup("ORIENTATION", {plan_view, front_view, side_view, align_object, projection_button}));
+    row->addWidget(makeRibbonGroup("MODE", {orbit_mode, fly_mode}));
+    row->addStretch(1);
+    return page;
+}
+
+QWidget* MockMainWindow::buildInspectRibbonPage() {
+    auto* page = new QFrame(this);
+    page->setObjectName("ribbonPage");
+    auto* row = new QHBoxLayout(page);
+    row->setContentsMargins(2, 4, 2, 4);
+    row->setSpacing(0);
+
+    auto* hide_selected = makeRibbonAction("Hide", ":/icons/eye-closed.svg");
+    connect(hide_selected, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Selection", "Hide selected coming soon");
+    });
+    auto* isolate_selected = makeRibbonAction("Isolate", ":/icons/eye-solid.svg");
+    connect(isolate_selected, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Selection", "Isolate selected coming soon");
+    });
+    auto* show_all = makeRibbonAction("Show All", ":/icons/eye.svg");
+    connect(show_all, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Selection", "Show all coming soon");
+    });
+    auto* invert_selection = makeRibbonAction("Invert", ":/icons/intersect.svg");
+    connect(invert_selection, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Selection", "Invert selection coming soon");
+    });
+
+    auto* distance = makeRibbonAction("Distance", ":/icons/select-edge3d.svg");
+    connect(distance, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Measure", "Distance coming soon");
+    });
+    auto* area = makeRibbonAction("Area", ":/icons/select-face3d.svg");
+    connect(area, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Measure", "Area coming soon");
+    });
+    auto* volume = makeRibbonAction("Volume", ":/icons/select-point3d.svg");
+    connect(volume, &QToolButton::clicked, this, [this]() {
+        setStatusMessage("Measure", "Volume coming soon");
+    });
+
+    row->addWidget(makeRibbonGroup("SELECTION", {hide_selected, isolate_selected, show_all, invert_selection}));
+    row->addWidget(makeRibbonGroup("MEASURE", {distance, area, volume}));
+    row->addStretch(1);
+    return page;
+}
+
+QWidget* MockMainWindow::buildPanelsRibbonPage() {
+    auto* page = new QFrame(this);
+    page->setObjectName("ribbonPage");
+    auto* row = new QHBoxLayout(page);
+    row->setContentsMargins(2, 4, 2, 4);
+    row->setSpacing(0);
+
+    row->addWidget(makeRibbonGroup("DATA", {
+        makePanelToggle("Models", models_dock_),
+        makePanelToggle("Spatial", spatial_dock_),
+        makePanelToggle("Layers", layers_dock_),
+        makePanelToggle("Properties", properties_dock_)
+    }));
+    row->addWidget(makeRibbonGroup("QUERY", {
+        makePanelToggle("Views", stored_views_dock_),
+        makePanelToggle("Search", search_dock_),
+        makePanelToggle("Sheets", spreadsheet_dock_)
+    }));
+    row->addWidget(makeRibbonGroup("COLLABORATE", {
+        makePanelToggle("Clash", clash_dock_),
+        makePanelToggle("Issues", issues_dock_)
+    }));
+    row->addStretch(1);
+    return page;
+}
+
+void MockMainWindow::setupRibbon() {
+    auto* shell = new QFrame(this);
+    shell->setObjectName("ribbonShell");
+
+    auto* shell_layout = new QVBoxLayout(shell);
+    shell_layout->setContentsMargins(0, 0, 0, 0);
+    shell_layout->setSpacing(0);
+
+    ribbon_tabs_ = new QTabBar(shell);
+    ribbon_tabs_->addTab("Home");
+    ribbon_tabs_->addTab("Navigate");
+    ribbon_tabs_->addTab("Inspect");
+    ribbon_tabs_->addTab("Panels");
+    ribbon_tabs_->setCurrentIndex(0);
+    ribbon_tabs_->setExpanding(false);
+    ribbon_tabs_->setDrawBase(false);
+
+    auto* ribbon_band = new QFrame(shell);
+    ribbon_band->setObjectName("ribbonBand");
+    auto* band_layout = new QVBoxLayout(ribbon_band);
+    band_layout->setContentsMargins(0, 0, 0, 0);
+    band_layout->setSpacing(0);
+
+    ribbon_pages_ = new QStackedWidget(ribbon_band);
+    ribbon_pages_->addWidget(buildHomeRibbonPage());
+    ribbon_pages_->addWidget(buildNavigateRibbonPage());
+    ribbon_pages_->addWidget(buildInspectRibbonPage());
+    ribbon_pages_->addWidget(buildPanelsRibbonPage());
+
+    band_layout->addWidget(ribbon_pages_);
+    shell_layout->addWidget(ribbon_tabs_);
+    shell_layout->addWidget(ribbon_band);
+
+    connect(ribbon_tabs_, &QTabBar::currentChanged,
+            ribbon_pages_, &QStackedWidget::setCurrentIndex);
+
+    setMenuWidget(shell);
+}
+
+void MockMainWindow::setupViewport() {
+    viewport_ = new ViewportWindow();
+    viewport_container_ = QWidget::createWindowContainer(viewport_, this);
+    viewport_container_->setMinimumSize(400, 300);
+    viewport_container_->setFocusPolicy(Qt::StrongFocus);
+
+    auto* shell = new QFrame(this);
+    shell->setObjectName("viewportShell");
+    auto* root = new QVBoxLayout(shell);
+    root->setContentsMargins(10, 10, 10, 10);
+    root->setSpacing(0);
+
+    auto* frame = new QFrame(shell);
+    frame->setObjectName("viewportFrame");
+    auto* frame_layout = new QVBoxLayout(frame);
+    frame_layout->setContentsMargins(0, 0, 0, 0);
+    frame_layout->addWidget(viewport_container_);
+
+    root->addWidget(frame);
+    setCentralWidget(shell);
+}
+
+void MockMainWindow::setupDocks() {
+    auto* models_panel = new QWidget(this);
+    auto* models_panel_layout = new QVBoxLayout(models_panel);
+    models_panel_layout->setContentsMargins(0, 0, 0, 0);
+    models_panel_layout->setSpacing(0);
+
+    auto* models_tree = new QTreeWidget(this);
+    models_tree->setColumnCount(2);
+    models_tree->setHeaderLabels({"Model", ""});
+    models_tree->setIconSize(QSize(16, 16));
+    models_tree->setSelectionMode(QAbstractItemView::ExtendedSelection);
+    models_tree->setContextMenuPolicy(Qt::CustomContextMenu);
+    models_tree->setUniformRowHeights(true);
+    models_tree->header()->setStretchLastSection(false);
+    models_tree->header()->setSectionResizeMode(0, QHeaderView::Stretch);
+    models_tree->header()->setSectionResizeMode(1, QHeaderView::Fixed);
+    models_tree->header()->resizeSection(1, 28);
+    models_tree->header()->hide();
+
+    auto* local_group = new QTreeWidgetItem(models_tree, {"Local Models", ""});
+    local_group->setIcon(0, makePanelSvgIcon(":/icons/folder.svg"));
+    local_group->setIcon(1, makePanelSvgIcon(":/icons/eye.svg"));
+    local_group->setData(1, Qt::UserRole, true);
+    local_group->setSizeHint(0, QSize(0, 24));
+    auto* linked_group = new QTreeWidgetItem(models_tree, {"Linked Models", ""});
+    linked_group->setIcon(0, makePanelSvgIcon(":/icons/folder.svg"));
+    linked_group->setIcon(1, makePanelSvgIcon(":/icons/eye.svg"));
+    linked_group->setData(1, Qt::UserRole, true);
+    linked_group->setSizeHint(0, QSize(0, 24));
+
+    auto make_model_item = [this](QTreeWidgetItem* parent, const QString& name, bool visible) {
+        auto* item = new QTreeWidgetItem(parent, {name, ""});
+        item->setIcon(0, makePanelSvgIcon(":/icons/cube.svg"));
+        item->setIcon(1, makePanelSvgIcon(visible ? ":/icons/eye-solid.svg" : ":/icons/eye.svg"));
+        item->setData(1, Qt::UserRole, visible);
+        item->setSizeHint(0, QSize(0, 24));
+        return item;
+    };
+
+    make_model_item(local_group, "Architecture.ifc", true);
+    make_model_item(local_group, "Structure.ifc", true);
+    make_model_item(linked_group, "MEP.ifc", false);
+    models_tree->expandAll();
+
+    models_panel_layout->addWidget(models_tree);
+
+    connect(models_tree, &QTreeWidget::itemClicked, this, [this](QTreeWidgetItem* item, int column) {
+        if (!item || column != 1) return;
+        const bool visible = item->data(1, Qt::UserRole).toBool();
+        const bool next_visible = !visible;
+        item->setData(1, Qt::UserRole, next_visible);
+        if (item->childCount() > 0) {
+            item->setIcon(1, makePanelSvgIcon(next_visible ? ":/icons/eye.svg" : ":/icons/eye-closed.svg"));
+        } else {
+            item->setIcon(1, makePanelSvgIcon(next_visible ? ":/icons/eye-solid.svg" : ":/icons/eye-closed.svg"));
+        }
+        setStatusMessage("Models", next_visible ? "Item shown" : "Item hidden");
+    });
+
+    connect(models_tree, &QTreeWidget::customContextMenuRequested, this, [this, models_tree](const QPoint& pos) {
+        auto* item = models_tree->itemAt(pos);
+        QMenu menu(models_tree);
+        if (item && item->childCount() > 0) {
+            menu.addAction(makePanelSvgIcon(":/icons/folder-plus.svg"), "Add Group", [this]() {
+                setStatusMessage("Models", "Add Group coming soon");
+            });
+            menu.addAction(makePanelSvgIcon(":/icons/folder-minus.svg"), "Remove Group", [this]() {
+                setStatusMessage("Models", "Remove Group coming soon");
+            });
+        }
+        if (item && item->childCount() == 0) {
+            menu.addAction(makePanelSvgIcon(":/icons/minus-square.svg"), "Remove Model", [this]() {
+                setStatusMessage("Models", "Remove Model coming soon");
+            });
+        }
+        menu.addAction(makePanelSvgIcon(":/icons/intersect.svg"), "Invert Visibility", [this]() {
+            setStatusMessage("Models", "Invert visibility coming soon");
+        });
+        if (!menu.actions().isEmpty()) menu.exec(models_tree->viewport()->mapToGlobal(pos));
+    });
+
+    auto* spatial_tree = new QTreeWidget(this);
+    spatial_tree->setColumnCount(2);
+    spatial_tree->setHeaderLabels({"Spatial Item", ""});
+    spatial_tree->setIconSize(QSize(16, 16));
+    spatial_tree->setSelectionMode(QAbstractItemView::ExtendedSelection);
+    spatial_tree->setUniformRowHeights(true);
+    spatial_tree->header()->setStretchLastSection(false);
+    spatial_tree->header()->setSectionResizeMode(0, QHeaderView::Stretch);
+    spatial_tree->header()->setSectionResizeMode(1, QHeaderView::Fixed);
+    spatial_tree->header()->resizeSection(1, 28);
+    spatial_tree->header()->hide();
+
+    auto make_spatial_item = [this](QTreeWidgetItem* parent, const QString& name, const QString& icon_path) {
+        auto* item = new QTreeWidgetItem(parent, {name, ""});
+        item->setIcon(0, makePanelSvgIcon(icon_path));
+        item->setIcon(1, makePanelSvgIcon(":/icons/eye.svg"));
+        item->setData(1, Qt::UserRole, true);
+        item->setSizeHint(0, QSize(0, 24));
+        return item;
+    };
+
+    auto* site = make_spatial_item(spatial_tree->invisibleRootItem(), "Site A", ":/icons/frame-alt.svg");
+    auto* building = make_spatial_item(site, "Building 01", ":/icons/city.svg");
+    auto* storey = make_spatial_item(building, "Level 02", ":/icons/planimetry.svg");
+    make_spatial_item(storey, "Lobby", ":/icons/square3d-from-center.svg");
+    make_spatial_item(storey, "Core", ":/icons/square3d-from-center.svg");
+    spatial_tree->expandAll();
+
+    connect(spatial_tree, &QTreeWidget::itemClicked, this, [this](QTreeWidgetItem* item, int column) {
+        if (!item || column != 1) return;
+        const bool visible = item->data(1, Qt::UserRole).toBool();
+        const bool next_visible = !visible;
+        item->setData(1, Qt::UserRole, next_visible);
+        item->setIcon(1, makePanelSvgIcon(next_visible ? ":/icons/eye.svg" : ":/icons/eye-closed.svg"));
+        setStatusMessage("Spatial", next_visible ? "Item shown" : "Item hidden");
+    });
+
+    auto* properties_content = new QWidget(this);
+    properties_content->setObjectName("inspectorPanel");
+    auto* properties_layout = new QVBoxLayout(properties_content);
+    properties_layout->setContentsMargins(0, 0, 0, 0);
+    properties_layout->setSpacing(12);
+
+    auto* entity_card = new QFrame(properties_content);
+    entity_card->setObjectName("entityClassCard");
+    auto* entity_layout = new QHBoxLayout(entity_card);
+    entity_layout->setContentsMargins(10, 8, 10, 8);
+    entity_layout->setSpacing(10);
+    auto* entity_icon = new QLabel(entity_card);
+    entity_icon->setPixmap(makePanelSvgPixmap(":/icons/cube-dots.svg", QSize(28, 28)));
+    entity_icon->setAlignment(Qt::AlignCenter);
+    auto* entity_text = new QWidget(entity_card);
+    auto* entity_text_layout = new QVBoxLayout(entity_text);
+    entity_text_layout->setContentsMargins(0, 0, 0, 0);
+    entity_text_layout->setSpacing(2);
+    auto* entity_class = new QLabel("IfcWall", entity_text);
+    entity_class->setObjectName("entityClassLabel");
+    auto* entity_type = new QLabel("SOLIDWALL", entity_text);
+    entity_type->setObjectName("entityTypeLabel");
+    entity_text_layout->addWidget(entity_class);
+    entity_text_layout->addWidget(entity_type);
+    entity_layout->addWidget(entity_icon, 0, Qt::AlignVCenter);
+    entity_layout->addWidget(entity_text, 1, Qt::AlignVCenter);
+
+    auto* attributes_section = makeInspectorSection(
+        "Attributes", "",
+        {
+            makeAttributeList({{"GlobalId", "2Q$n5SLPP9Q8B7wQKjKfUQ"},
+                               {"Name", "Core-EXT-204"},
+                               {"Description", "External load-bearing wall"}}, properties_content)
+        },
+        properties_content);
+
+    auto* properties_section = makeInspectorSection(
+        "Properties", "Filter properties or sets",
+        {
+            makePropertySetPanel("Pset_WallCommon",
+                                 {{"Reference", "Core-EXT-204"},
+                                  {"Status", "Reviewed"},
+                                  {"Fire Rating", "120 min"},
+                                  {"LoadBearing", "True"}},
+                                 properties_content),
+            makePropertySetPanel("Identity Data",
+                                 {{"Type", "IfcWall"},
+                                  {"Name", "Core-EXT-204"},
+                                  {"Owner", "Architecture"},
+                                  {"Phase", "Construction"}},
+                                 properties_content),
+            makePropertySetPanel("BIM Collaboration",
+                                 {{"Issue Count", "2 open"},
+                                  {"Last Review", "2026-04-30"},
+                                  {"Assigned To", "Design Coordination"}},
+                                 properties_content)
+        },
+        properties_content);
+
+    qobject_cast<QVBoxLayout*>(attributes_section->layout())->setSpacing(8);
+
+    auto* relationships_section = makeInspectorSection(
+        "Relationships", "",
+        {
+            makeRelationshipList({{"Type", "Basic Wall: Exterior - 200mm"},
+                                  {"Container", "Level 02"}}, properties_content)
+        },
+        properties_content);
+
+    auto* quantities_section = makeInspectorSection(
+        "Quantities", "Filter quantities or sets",
+        {
+            makePropertySetPanel("BaseQuantities",
+                                 {{"Length", "6.20 m"},
+                                  {"Height", "3.45 m"},
+                                  {"Width", "0.30 m"},
+                                  {"Volume", "6.42 m3"}},
+                                 properties_content),
+            makePropertySetPanel("Finish Quantities",
+                                 {{"NetSideArea", "21.39 m2"},
+                                  {"GrossArea", "22.10 m2"},
+                                  {"Paint Coverage", "42.78 m2"}},
+                                 properties_content)
+        },
+        properties_content);
+
+    auto* entity_wrapper = new QWidget(properties_content);
+    entity_wrapper->setObjectName("inspectorSectionBody");
+    auto* entity_wrapper_layout = new QVBoxLayout(entity_wrapper);
+    entity_wrapper_layout->setContentsMargins(10, 0, 10, 0);
+    entity_wrapper_layout->setSpacing(0);
+    entity_wrapper_layout->addWidget(entity_card);
+
+    properties_layout->addWidget(entity_wrapper);
+    properties_layout->addWidget(attributes_section);
+    properties_layout->addWidget(relationships_section);
+    properties_layout->addWidget(properties_section);
+    properties_layout->addWidget(quantities_section);
+    properties_layout->addStretch(1);
+
+    auto* properties_scroll = new QScrollArea(this);
+    properties_scroll->setWidgetResizable(true);
+    properties_scroll->setFrameShape(QFrame::NoFrame);
+    properties_scroll->setWidget(properties_content);
+
+    models_dock_ = makeDock("Models", wrapPanel(models_panel), this, true);
+    spatial_dock_ = makeDock("Spatial Hierarchy", wrapPanel(spatial_tree), this);
+    properties_dock_ = makeDock("Properties", wrapInspectorPanel(properties_scroll), this);
+    layers_dock_ = makeDock("Layers", wrapPanel(makeComingSoonPanel("Layers")), this);
+    stored_views_dock_ = makeDock("Stored Views", wrapPanel(makeComingSoonPanel("Stored Views")), this);
+    search_dock_ = makeDock("Search and Query", wrapPanel(makeComingSoonPanel("Search and Query")), this);
+    spreadsheet_dock_ = makeDock("Spreadsheet", wrapPanel(makeComingSoonPanel("Spreadsheet")), this);
+    clash_dock_ = makeDock("Clash", wrapPanel(makeComingSoonPanel("Clash")), this);
+    issues_dock_ = makeDock("Issues", wrapPanel(makeComingSoonPanel("Issues")), this);
+
+    addDockWidget(Qt::LeftDockWidgetArea, models_dock_);
+    addDockWidget(Qt::LeftDockWidgetArea, spatial_dock_);
+    splitDockWidget(models_dock_, spatial_dock_, Qt::Vertical);
+
+    addDockWidget(Qt::RightDockWidgetArea, properties_dock_);
+    addDockWidget(Qt::RightDockWidgetArea, layers_dock_);
+    addDockWidget(Qt::RightDockWidgetArea, stored_views_dock_);
+    addDockWidget(Qt::RightDockWidgetArea, search_dock_);
+    addDockWidget(Qt::RightDockWidgetArea, spreadsheet_dock_);
+    addDockWidget(Qt::RightDockWidgetArea, clash_dock_);
+    addDockWidget(Qt::RightDockWidgetArea, issues_dock_);
+
+    tabifyDockWidget(properties_dock_, layers_dock_);
+    tabifyDockWidget(layers_dock_, stored_views_dock_);
+    tabifyDockWidget(stored_views_dock_, search_dock_);
+    tabifyDockWidget(search_dock_, spreadsheet_dock_);
+    tabifyDockWidget(spreadsheet_dock_, clash_dock_);
+    tabifyDockWidget(clash_dock_, issues_dock_);
+    properties_dock_->raise();
+
+    layers_dock_->hide();
+    stored_views_dock_->hide();
+    search_dock_->hide();
+    spreadsheet_dock_->hide();
+    clash_dock_->hide();
+    issues_dock_->hide();
+
+    resizeDocks({models_dock_, properties_dock_}, {290, 330}, Qt::Horizontal);
+    resizeDocks({models_dock_, spatial_dock_}, {280, 240}, Qt::Vertical);
+}
+
+void MockMainWindow::setupStatus() {
+    status_mode_label_ = new QLabel("Ready", this);
+    status_selection_label_ = new QLabel("No selection", this);
+    status_perf_label_ = new QLabel(this);
+    status_perf_label_->setVisible(AppSettings::instance().showStats());
+
+    statusBar()->setSizeGripEnabled(false);
+    statusBar()->addWidget(status_mode_label_);
+    statusBar()->addWidget(status_selection_label_, 1);
+    statusBar()->addPermanentWidget(status_perf_label_);
+
+    connect(&AppSettings::instance(), &AppSettings::showStatsChanged, this, [this](bool show) {
+        status_perf_label_->setVisible(show);
+        if (!show) status_perf_label_->clear();
+    });
+}
+
+void MockMainWindow::setupLoader() {
+    AppSettings::instance().setLoadDataSource(false);
+    loader_ = new SceneLoader(viewport_, this);
+    connect(loader_, &SceneLoader::loadStarted, this, &MockMainWindow::onLoadStarted);
+    connect(loader_, &SceneLoader::loadedFromSidecar, this, &MockMainWindow::onLoadedFromSidecar);
+    connect(loader_, &SceneLoader::loadedFromStream, this, &MockMainWindow::onLoadedFromStream);
+    connect(loader_, &SceneLoader::loadCancelled, this, &MockMainWindow::onLoadCancelled);
+    connect(loader_, &SceneLoader::loadError, this, &MockMainWindow::onLoadError);
+    connect(loader_, &SceneLoader::allLoadsFinished, this, &MockMainWindow::onAllLoadsFinished);
+
+    connect(viewport_, &ViewportWindow::frameStatsUpdated, this,
+            [this](const ViewportWindow::FrameStats& s) {
+        if (!status_perf_label_->isVisible()) return;
+        status_perf_label_->setText(
+            QString("%1 fps | %2 ms | %3/%4 obj | %5/%6 tri | %7 draws")
+                .arg(s.fps, 0, 'f', 1)
+                .arg(s.frame_time_ms, 0, 'f', 1)
+                .arg(s.visible_objects)
+                .arg(s.total_objects)
+                .arg(s.visible_triangles)
+                .arg(s.total_triangles)
+                .arg(s.gl_draw_calls));
+    });
+}
+
+void MockMainWindow::addFiles(const QStringList& paths) {
+    if (paths.isEmpty()) return;
+    loader_->addFiles(paths);
+}
+
+QString MockMainWindow::formatElapsed(qint64 ms) const {
+    return (ms >= 1000)
+        ? QString::number(ms / 1000.0, 'f', 2) + " s"
+        : QString::number(ms) + " ms";
+}
+
+void MockMainWindow::onAddFiles() {
+    const QStringList paths = QFileDialog::getOpenFileNames(
+        this, "Add IFC Files", QString(),
+        "IFC Viewer Cache (*.ifcview)");
+    addFiles(paths);
+}
+
+void MockMainWindow::onLoadStarted(uint32_t /*mid*/, QString display_name) {
+    status_mode_label_->setText("Loading");
+    status_selection_label_->setText(display_name);
+}
+
+void MockMainWindow::onLoadedFromSidecar(uint32_t mid, qint64 elapsed_ms) {
+    status_mode_label_->setText("Loaded");
+    status_selection_label_->setText(
+        QString("%1 from cache in %2")
+            .arg(loader_->displayName(mid))
+            .arg(formatElapsed(elapsed_ms)));
+}
+
+void MockMainWindow::onLoadedFromStream(uint32_t mid, qint64 elapsed_ms) {
+    status_mode_label_->setText("Loaded");
+    status_selection_label_->setText(
+        QString("%1 streamed in %2")
+            .arg(loader_->displayName(mid))
+            .arg(formatElapsed(elapsed_ms)));
+}
+
+void MockMainWindow::onLoadCancelled(uint32_t mid) {
+    status_mode_label_->setText("Cancelled");
+    status_selection_label_->setText(loader_->displayName(mid));
+}
+
+void MockMainWindow::onLoadError(uint32_t /*mid*/, QString message) {
+    status_mode_label_->setText("Error");
+    status_selection_label_->setText(message);
+    QMessageBox::warning(this, "IfcInterfaceMockup", message);
+}
+
+void MockMainWindow::onAllLoadsFinished() {
+    status_mode_label_->setText("Loaded");
+    status_selection_label_->setText(QString("%1 model(s)").arg(loader_->modelCount()));
+}
diff --git a/src/interface/MockMainWindow.h b/src/interface/MockMainWindow.h
new file mode 100644
index 0000000000..81da53db90
--- /dev/null
+++ b/src/interface/MockMainWindow.h
@@ -0,0 +1,88 @@
+// This file was generated with the assistance of an AI coding tool.
+/********************************************************************************
+ *                                                                              *
+ * This file is part of IfcOpenShell.                                           *
+ *                                                                              *
+ * IfcOpenShell is free software: you can redistribute it and/or modify         *
+ * it under the terms of the Lesser GNU General Public License as published by  *
+ * the Free Software Foundation, either version 3.0 of the License, or          *
+ * (at your option) any later version.                                          *
+ *                                                                              *
+ * IfcOpenShell is distributed in the hope that it will be useful,              *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of               *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                 *
+ * Lesser GNU General Public License for more details.                          *
+ *                                                                              *
+ * You should have received a copy of the Lesser GNU General Public License     *
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.         *
+ *                                                                              *
+ ********************************************************************************/
+
+#ifndef IFCINTERFACE_MOCKMAINWINDOW_H
+#define IFCINTERFACE_MOCKMAINWINDOW_H
+
+#include <QMainWindow>
+#include <QStringList>
+
+class QLabel;
+class QDockWidget;
+class QStackedWidget;
+class QTabBar;
+class QToolButton;
+class ViewportWindow;
+class SceneLoader;
+
+class MockMainWindow : public QMainWindow {
+    Q_OBJECT
+public:
+    explicit MockMainWindow(QWidget* parent = nullptr);
+
+private:
+    void setupChrome();
+    void setupRibbon();
+    void setupViewport();
+    void setupDocks();
+    void setupStatus();
+    void setupLoader();
+    QWidget* buildHomeRibbonPage();
+    QWidget* buildNavigateRibbonPage();
+    QWidget* buildInspectRibbonPage();
+    QWidget* buildPanelsRibbonPage();
+    QToolButton* makeRibbonAction(const QString& text, const QString& icon_path);
+    QWidget* makeRibbonGroup(const QString& title, const QList<QToolButton*>& buttons);
+    QWidget* makeComingSoonPanel(const QString& title);
+    QToolButton* makePanelToggle(const QString& text, QDockWidget* dock);
+    void setStatusMessage(const QString& mode, const QString& detail);
+    void addFiles(const QStringList& paths);
+    QString formatElapsed(qint64 ms) const;
+
+private slots:
+    void onAddFiles();
+    void onLoadStarted(uint32_t mid, QString display_name);
+    void onLoadedFromSidecar(uint32_t mid, qint64 elapsed_ms);
+    void onLoadedFromStream(uint32_t mid, qint64 elapsed_ms);
+    void onLoadCancelled(uint32_t mid);
+    void onLoadError(uint32_t mid, QString message);
+    void onAllLoadsFinished();
+
+private:
+    QLabel* status_mode_label_ = nullptr;
+    QLabel* status_selection_label_ = nullptr;
+    QLabel* status_perf_label_ = nullptr;
+    QTabBar* ribbon_tabs_ = nullptr;
+    QStackedWidget* ribbon_pages_ = nullptr;
+    ViewportWindow* viewport_ = nullptr;
+    SceneLoader* loader_ = nullptr;
+    QWidget* viewport_container_ = nullptr;
+    QDockWidget* models_dock_ = nullptr;
+    QDockWidget* spatial_dock_ = nullptr;
+    QDockWidget* layers_dock_ = nullptr;
+    QDockWidget* properties_dock_ = nullptr;
+    QDockWidget* stored_views_dock_ = nullptr;
+    QDockWidget* search_dock_ = nullptr;
+    QDockWidget* spreadsheet_dock_ = nullptr;
+    QDockWidget* clash_dock_ = nullptr;
+    QDockWidget* issues_dock_ = nullptr;
+};
+
+#endif
diff --git a/src/interface/icons/box-3d-center.svg b/src/interface/icons/box-3d-center.svg
new file mode 100644
index 0000000000..2821094abd
--- /dev/null
+++ b/src/interface/icons/box-3d-center.svg
@@ -0,0 +1,8 @@
+<svg width="24" height="24" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M12 17C12.5523 17 13 16.5523 13 16C13 15.4477 12.5523 15 12 15C11.4477 15 11 15.4477 11 16C11 16.5523 11.4477 17 12 17Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M21 7.35304L21 16.647C21 16.8649 20.8819 17.0656 20.6914 17.1715L12.2914 21.8381C12.1102 21.9388 11.8898 21.9388 11.7086 21.8381L3.30861 17.1715C3.11814 17.0656 3 16.8649 3 16.647L2.99998 7.35304C2.99998 7.13514 3.11812 6.93437 3.3086 6.82855L11.7086 2.16188C11.8898 2.06121 12.1102 2.06121 12.2914 2.16188L20.6914 6.82855C20.8818 6.93437 21 7.13514 21 7.35304Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M20.5 16.7222L12.2914 12.1618C12.1102 12.0612 11.8898 12.0612 11.7086 12.1618L3.5 16.7222" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M3.52844 7.29363L11.7086 11.8382C11.8898 11.9388 12.1102 11.9388 12.2914 11.8382L20.5 7.27783" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M12 3L12 12" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M12 19.5V22" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/box-3d-three-points.svg b/src/interface/icons/box-3d-three-points.svg
new file mode 100644
index 0000000000..a925b676b1
--- /dev/null
+++ b/src/interface/icons/box-3d-three-points.svg
@@ -0,0 +1,8 @@
+<svg width="24" height="24" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M12 23C12.5523 23 13 22.5523 13 22C13 21.4477 12.5523 21 12 21C11.4477 21 11 21.4477 11 22C11 22.5523 11.4477 23 12 23Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M3 8C3.55228 8 4 7.55228 4 7C4 6.44772 3.55228 6 3 6C2.44772 6 2 6.44772 2 7C2 7.55228 2.44772 8 3 8Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M3 18C3.55228 18 4 17.5523 4 17C4 16.4477 3.55228 16 3 16C2.44772 16 2 16.4477 2 17C2 17.5523 2.44772 18 3 18Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M21 7.35304L21 16.647C21 16.8649 20.8819 17.0656 20.6914 17.1715L12.2914 21.8381C12.1102 21.9388 11.8898 21.9388 11.7086 21.8381L3.30861 17.1715C3.11814 17.0656 3 16.8649 3 16.647L2.99998 7.35304C2.99998 7.13514 3.11812 6.93437 3.3086 6.82855L11.7086 2.16188C11.8898 2.06121 12.1102 2.06121 12.2914 2.16188L20.6914 6.82855C20.8818 6.93437 21 7.13514 21 7.35304Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M3.52844 7.29363L11.7086 11.8382C11.8898 11.9388 12.1102 11.9388 12.2914 11.8382L20.5 7.27783" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M12 21L12 12" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/building.svg b/src/interface/icons/building.svg
new file mode 100644
index 0000000000..3c1cbcd15a
--- /dev/null
+++ b/src/interface/icons/building.svg
@@ -0,0 +1,9 @@
+<svg width="24" height="24" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M10 9.01L10.01 8.99889" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M14 9.01L14.01 8.99889" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M10 13.01L10.01 12.9989" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M14 13.01L14.01 12.9989" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M10 17.01L10.01 16.9989" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M14 17.01L14.01 16.9989" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M6 20.4V5.6C6 5.26863 6.26863 5 6.6 5H12V3.6C12 3.26863 12.2686 3 12.6 3H17.4C17.7314 3 18 3.26863 18 3.6V20.4C18 20.7314 17.7314 21 17.4 21H6.6C6.26863 21 6 20.7314 6 20.4Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/cellar.svg b/src/interface/icons/cellar.svg
new file mode 100644
index 0000000000..a7548be21d
--- /dev/null
+++ b/src/interface/icons/cellar.svg
@@ -0,0 +1,6 @@
+<svg width="24" height="24" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M3 21H21V12C21 9.61305 20.0518 7.32387 18.364 5.63604C16.6761 3.94821 14.3869 3 12 3C9.61305 3 7.32387 3.94821 5.63604 5.63604C3.94821 7.32387 3 9.61305 3 12V21Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M3 17L21 17" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M9 17V13H21" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M13 13V9H20" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/city.svg b/src/interface/icons/city.svg
new file mode 100644
index 0000000000..d7ea85ade2
--- /dev/null
+++ b/src/interface/icons/city.svg
@@ -0,0 +1,9 @@
+<svg width="24" height="24" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M7 9.01L7.01 8.99889" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M11 9.01L11.01 8.99889" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M7 13.01L7.01 12.9989" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M11 13.01L11.01 12.9989" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M7 17.01L7.01 16.9989" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M11 17.01L11.01 16.9989" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M15 21H3.6C3.26863 21 3 20.7314 3 20.4V5.6C3 5.26863 3.26863 5 3.6 5H9V3.6C9 3.26863 9.26863 3 9.6 3H14.4C14.7314 3 15 3.26863 15 3.6V9M15 21H20.4C20.7314 21 21 20.7314 21 20.4V9.6C21 9.26863 20.7314 9 20.4 9H15M15 21V17M15 9V13M15 13H17M15 13V17M15 17H17" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/clock-rotate-right.svg b/src/interface/icons/clock-rotate-right.svg
new file mode 100644
index 0000000000..38216101ec
--- /dev/null
+++ b/src/interface/icons/clock-rotate-right.svg
@@ -0,0 +1,5 @@
+<svg width="24" height="24" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M12 6L12 12L18 12" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M21.8883 10.5C21.1645 5.68874 17.013 2 12 2C6.47715 2 2 6.47715 2 12C2 17.5228 6.47715 22 12 22C16.1006 22 19.6248 19.5318 21.1679 16" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M17 16H21.4C21.7314 16 22 16.2686 22 16.6V21" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/cloud-square.svg b/src/interface/icons/cloud-square.svg
new file mode 100644
index 0000000000..03be85183d
--- /dev/null
+++ b/src/interface/icons/cloud-square.svg
@@ -0,0 +1,4 @@
+<svg width="24" height="24" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M3 20.4V3.6C3 3.26863 3.26863 3 3.6 3H20.4C20.7314 3 21 3.26863 21 3.6V20.4C21 20.7314 20.7314 21 20.4 21H3.6C3.26863 21 3 20.7314 3 20.4Z" stroke="currentColor" stroke-width="1.5"/>
+<path d="M12 8C8.72727 8 8.72727 10 8.72727 11C7.81818 11 6 11.5 6 13.5C6 15.5 7.81818 16 8.72727 16H15.2727C16.1818 16 18 15.5 18 13.5C18 11.5 16.1818 11 15.2727 11C15.2727 10 15.2727 8 12 8Z" stroke="currentColor" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/cube-dots.svg b/src/interface/icons/cube-dots.svg
new file mode 100644
index 0000000000..f42a21121a
--- /dev/null
+++ b/src/interface/icons/cube-dots.svg
@@ -0,0 +1,8 @@
+<svg width="24" height="24" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M12.4961 19.7165L18.4961 16.2879C18.8077 16.1099 19 15.7785 19 15.4197V9.58032C19 9.22147 18.8077 8.89012 18.4961 8.71208L12.4961 5.28351C12.1887 5.10783 11.8113 5.10783 11.5039 5.28351L5.50386 8.71208C5.19229 8.89012 5 9.22147 5 9.58032V15.4197C5 15.7785 5.19229 16.1099 5.50386 16.2879L11.5039 19.7165C11.8113 19.8922 12.1887 19.8922 12.4961 19.7165Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M5.5 9.5L12 13M12 13L18.5 9.5M12 13V19.5" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M3 3.01013L3.01 2.99902" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M3 21.0101L3.01 20.999" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M21 3.01013L21.01 2.99902" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M21 21.0101L21.01 20.999" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/cube-scan-solid.svg b/src/interface/icons/cube-scan-solid.svg
new file mode 100644
index 0000000000..ba150bae1a
--- /dev/null
+++ b/src/interface/icons/cube-scan-solid.svg
@@ -0,0 +1,7 @@
+<svg width="24" height="24" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M2.25 3C2.25 2.58579 2.58579 2.25 3 2.25H6C6.41421 2.25 6.75 2.58579 6.75 3C6.75 3.41421 6.41421 3.75 6 3.75H3.75V6C3.75 6.41421 3.41421 6.75 3 6.75C2.58579 6.75 2.25 6.41421 2.25 6V3Z" fill="currentColor"/>
+<path fill-rule="evenodd" clip-rule="evenodd" d="M17.25 3C17.25 2.58579 17.5858 2.25 18 2.25H21C21.4142 2.25 21.75 2.58579 21.75 3V6C21.75 6.41421 21.4142 6.75 21 6.75C20.5858 6.75 20.25 6.41421 20.25 6V3.75H18C17.5858 3.75 17.25 3.41421 17.25 3Z" fill="currentColor"/>
+<path fill-rule="evenodd" clip-rule="evenodd" d="M3 17.25C3.41421 17.25 3.75 17.5858 3.75 18V20.25H6C6.41421 20.25 6.75 20.5858 6.75 21C6.75 21.4142 6.41421 21.75 6 21.75H3C2.58579 21.75 2.25 21.4142 2.25 21V18C2.25 17.5858 2.58579 17.25 3 17.25Z" fill="currentColor"/>
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new file mode 100644
index 0000000000..286cb4d9b4
--- /dev/null
+++ b/src/interface/icons/cube-scan.svg
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new file mode 100644
index 0000000000..85290d7c18
--- /dev/null
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diff --git a/src/interface/icons/cursor-pointer.svg b/src/interface/icons/cursor-pointer.svg
new file mode 100644
index 0000000000..c05a6ab739
--- /dev/null
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diff --git a/src/interface/icons/download-square.svg b/src/interface/icons/download-square.svg
new file mode 100644
index 0000000000..9fa31e236f
--- /dev/null
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new file mode 100644
index 0000000000..278a3a9d35
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new file mode 100644
index 0000000000..1854ee3f67
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new file mode 100644
index 0000000000..030e83b5ac
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diff --git a/src/interface/icons/eye.svg b/src/interface/icons/eye.svg
new file mode 100644
index 0000000000..9db8457784
--- /dev/null
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diff --git a/src/interface/icons/face-3d-draft.svg b/src/interface/icons/face-3d-draft.svg
new file mode 100644
index 0000000000..f1f458a5e2
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new file mode 100644
index 0000000000..7f01001139
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diff --git a/src/interface/icons/floppy-disk-arrow-in.svg b/src/interface/icons/floppy-disk-arrow-in.svg
new file mode 100644
index 0000000000..49811f93a0
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+++ b/src/interface/icons/floppy-disk-arrow-in.svg
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diff --git a/src/interface/icons/floppy-disk.svg b/src/interface/icons/floppy-disk.svg
new file mode 100644
index 0000000000..bb7828aab1
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diff --git a/src/interface/icons/folder-minus.svg b/src/interface/icons/folder-minus.svg
new file mode 100644
index 0000000000..4173fc6dba
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new file mode 100644
index 0000000000..b39508e411
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new file mode 100644
index 0000000000..ccc42cb6f8
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new file mode 100644
index 0000000000..45d917240a
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diff --git a/src/interface/icons/home-alt.svg b/src/interface/icons/home-alt.svg
new file mode 100644
index 0000000000..9278f10f59
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new file mode 100644
index 0000000000..d8f1e2262a
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+<path d="M20 11V19C20 20.1046 19.1046 21 18 21H6C4.89543 21 4 20.1046 4 19V11" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/intersect.svg b/src/interface/icons/intersect.svg
new file mode 100644
index 0000000000..64cc346750
--- /dev/null
+++ b/src/interface/icons/intersect.svg
@@ -0,0 +1,12 @@
+<svg width="24" height="24" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M21 13.5V16.5M13.5 21H16.5" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M16.5 9H9.6C9.26863 9 9 9.26863 9 9.6V16.5" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M10.5 21H9.6C9.26863 21 9 20.7314 9 20.4V19.5" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M21 19.5V20.4C21 20.7314 20.7314 21 20.4 21H19.5" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M19.5 9H20.4C20.7314 9 21 9.26863 21 9.6V10.5" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M3 10.5V7.5M7.5 3H10.5" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M7.5 15H14.4C14.7314 15 15 14.7314 15 14.4V7.5" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M4.5 15H3.6C3.26863 15 3 14.7314 3 14.4V13.5" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M3 4.5V3.6C3 3.26863 3.26863 3 3.6 3H4.5" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M13.5 3H14.4C14.7314 3 15 3.26863 15 3.6V4.5" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/minus-square.svg b/src/interface/icons/minus-square.svg
new file mode 100644
index 0000000000..cf268693b8
--- /dev/null
+++ b/src/interface/icons/minus-square.svg
@@ -0,0 +1,4 @@
+<svg width="24" height="24" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M9 12H12H15" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M21 3.6V20.4C21 20.7314 20.7314 21 20.4 21H3.6C3.26863 21 3 20.7314 3 20.4V3.6C3 3.26863 3.26863 3 3.6 3H20.4C20.7314 3 21 3.26863 21 3.6Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/perspective-view.svg b/src/interface/icons/perspective-view.svg
new file mode 100644
index 0000000000..fd980d30ff
--- /dev/null
+++ b/src/interface/icons/perspective-view.svg
@@ -0,0 +1,9 @@
+<svg width="24" height="24" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M1 21L4.14286 3H19.8571L23 21H1Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M2 16.5H22" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M3 12H21" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M4 7.5H20" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M12 3V21" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M8 3.5L6.5 20.5" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M16 3.5L17.5 20.5" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/planimetry.svg b/src/interface/icons/planimetry.svg
new file mode 100644
index 0000000000..dca2cf94c3
--- /dev/null
+++ b/src/interface/icons/planimetry.svg
@@ -0,0 +1,10 @@
+<svg width="24" height="24" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M11 16L11 11L3 11" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M21 8H15V10" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M15 18L15 21" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M11 19V21" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M11 3V6" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M21 15H15L15 13" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M11 9V11" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M21 3.6V20.4C21 20.7314 20.7314 21 20.4 21H3.6C3.26863 21 3 20.7314 3 20.4V3.6C3 3.26863 3.26863 3 3.6 3H20.4C20.7314 3 21 3.26863 21 3.6Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/plus-square.svg b/src/interface/icons/plus-square.svg
new file mode 100644
index 0000000000..d347206808
--- /dev/null
+++ b/src/interface/icons/plus-square.svg
@@ -0,0 +1,4 @@
+<svg width="24" height="24" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M9 12H12M15 12H12M12 12V9M12 12V15" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M21 3.6V20.4C21 20.7314 20.7314 21 20.4 21H3.6C3.26863 21 3 20.7314 3 20.4V3.6C3 3.26863 3.26863 3 3.6 3H20.4C20.7314 3 21 3.26863 21 3.6Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/refresh-double.svg b/src/interface/icons/refresh-double.svg
new file mode 100644
index 0000000000..6d70aaef0b
--- /dev/null
+++ b/src/interface/icons/refresh-double.svg
@@ -0,0 +1,6 @@
+<svg width="24" height="24" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M21.1679 8C19.6247 4.46819 16.1006 2 11.9999 2C6.81459 2 2.55104 5.94668 2.04932 11" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M17 8H21.4C21.7314 8 22 7.73137 22 7.4V3" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M2.88146 16C4.42458 19.5318 7.94874 22 12.0494 22C17.2347 22 21.4983 18.0533 22 13" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M7.04932 16H2.64932C2.31795 16 2.04932 16.2686 2.04932 16.6V21" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/rotate-camera-right.svg b/src/interface/icons/rotate-camera-right.svg
new file mode 100644
index 0000000000..fca1c4e747
--- /dev/null
+++ b/src/interface/icons/rotate-camera-right.svg
@@ -0,0 +1,6 @@
+<svg width="24" height="24" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M22.0028 3V7.49704C22.0028 7.77482 21.7776 8 21.4998 8V8C21.2999 8 21.12 7.88104 21.034 7.70059C19.4262 4.32948 15.9866 2 12.0028 2C6.81746 2 2.55391 5.94668 2.05219 11" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M6 16.4V9.39365C6 9.06228 6.26863 8.79365 6.6 8.79365H7.77283C7.97677 8.79365 8.16674 8.69006 8.2772 8.51863L9.7228 6.27502C9.83326 6.10359 10.0232 6 10.2272 6H13.7728C13.9768 6 14.1667 6.10359 14.2772 6.27502L15.7228 8.51863C15.8333 8.69006 16.0232 8.79365 16.2272 8.79365H17.4C17.7314 8.79365 18 9.06228 18 9.39365V16.4C18 16.7314 17.7314 17 17.4 17H6.6C6.26863 17 6 16.7314 6 16.4Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M12 14C13.1046 14 14 13.1046 14 12C14 10.8954 13.1046 10 12 10C10.8954 10 10 10.8954 10 12C10 13.1046 10.8954 14 12 14Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M2.05078 21V16.503C2.05078 16.2252 2.27596 16 2.55374 16V16C2.75366 16 2.93357 16.119 3.01963 16.2994C4.62737 19.6705 8.06703 22 12.0508 22C17.2361 22 21.4997 18.0533 22.0014 13" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/select-edge3d.svg b/src/interface/icons/select-edge3d.svg
new file mode 100644
index 0000000000..39700d70fe
--- /dev/null
+++ b/src/interface/icons/select-edge3d.svg
@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><svg width="24px" height="24px" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" color="#000000"><path d="M21 7.35304L21 16.647C21 16.8649 20.8819 17.0656 20.6914 17.1715L12.2914 21.8381C12.1102 21.9388 11.8898 21.9388 11.7086 21.8381L3.30861 17.1715C3.11814 17.0656 3 16.8649 3 16.647L2.99998 7.35304C2.99998 7.13514 3.11812 6.93437 3.3086 6.82855L11.7086 2.16188C11.8898 2.06121 12.1102 2.06121 12.2914 2.16188L20.6914 6.82855C20.8818 6.93437 21 7.13514 21 7.35304Z" stroke="#000000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path><path d="M12 21L12 12" stroke="#000000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path><path d="M12.5 11V21C12.5 21.2761 12.2761 21.5 12 21.5C11.7239 21.5 11.5 21.2761 11.5 21V11C11.5 10.7239 11.7239 10.5 12 10.5C12.2761 10.5 12.5 10.7239 12.5 11Z" fill="#000000" stroke="#000000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path></svg>
\ No newline at end of file
diff --git a/src/interface/icons/select-face3d.svg b/src/interface/icons/select-face3d.svg
new file mode 100644
index 0000000000..f7b04f3d6a
--- /dev/null
+++ b/src/interface/icons/select-face3d.svg
@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><svg width="24px" height="24px" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" color="#000000"><path d="M21 7.35304L21 16.647C21 16.8649 20.8819 17.0656 20.6914 17.1715L12.2914 21.8381C12.1102 21.9388 11.8898 21.9388 11.7086 21.8381L3.30861 17.1715C3.11814 17.0656 3 16.8649 3 16.647L2.99998 7.35304C2.99998 7.13514 3.11812 6.93437 3.3086 6.82855L11.7086 2.16188C11.8898 2.06121 12.1102 2.06121 12.2914 2.16188L20.6914 6.82855C20.8818 6.93437 21 7.13514 21 7.35304Z" stroke="#000000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path><path d="M3.52844 7.29357L11.7086 11.8381C11.8898 11.9388 12.1102 11.9388 12.2914 11.8381L20.5 7.27777" stroke="#000000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path><path d="M12 21L12 12" stroke="#000000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path><path d="M11.6914 11.8285L3.89139 7.49521C3.49147 7.27304 3 7.56222 3 8.01971V16.647C3 16.8649 3.11813 17.0656 3.30861 17.1715L11.1086 21.5048C11.5085 21.727 12 21.4378 12 20.9803V12.353C12 12.1351 11.8819 11.9344 11.6914 11.8285Z" fill="#000000" stroke="#000000" stroke-width="1.5" stroke-linejoin="round"></path></svg>
\ No newline at end of file
diff --git a/src/interface/icons/select-point3d.svg b/src/interface/icons/select-point3d.svg
new file mode 100644
index 0000000000..3a6bbd6fd1
--- /dev/null
+++ b/src/interface/icons/select-point3d.svg
@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><svg width="24px" height="24px" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" color="#000000"><path d="M12 13C12.5523 13 13 12.5523 13 12C13 11.4477 12.5523 11 12 11C11.4477 11 11 11.4477 11 12C11 12.5523 11.4477 13 12 13Z" fill="#000000" stroke="#000000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path><path d="M21 7.35304L21 16.647C21 16.8649 20.8819 17.0656 20.6914 17.1715L12.2914 21.8381C12.1102 21.9388 11.8898 21.9388 11.7086 21.8381L3.30861 17.1715C3.11814 17.0656 3 16.8649 3 16.647L2.99998 7.35304C2.99998 7.13514 3.11812 6.93437 3.3086 6.82855L11.7086 2.16188C11.8898 2.06121 12.1102 2.06121 12.2914 2.16188L20.6914 6.82855C20.8818 6.93437 21 7.13514 21 7.35304Z" stroke="#000000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path></svg>
\ No newline at end of file
diff --git a/src/interface/icons/settings.svg b/src/interface/icons/settings.svg
new file mode 100644
index 0000000000..177771faee
--- /dev/null
+++ b/src/interface/icons/settings.svg
@@ -0,0 +1,4 @@
+<svg width="24" height="24" stroke-width="1.5" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M12 15C13.6569 15 15 13.6569 15 12C15 10.3431 13.6569 9 12 9C10.3431 9 9 10.3431 9 12C9 13.6569 10.3431 15 12 15Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M19.6224 10.3954L18.5247 7.7448L20 6L18 4L16.2647 5.48295L13.5578 4.36974L12.9353 2H10.981L10.3491 4.40113L7.70441 5.51596L6 4L4 6L5.45337 7.78885L4.3725 10.4463L2 11V13L4.40111 13.6555L5.51575 16.2997L4 18L6 20L7.79116 18.5403L10.397 19.6123L11 22H13L13.6045 19.6132L16.2551 18.5155C16.6969 18.8313 18 20 18 20L20 18L18.5159 16.2494L19.6139 13.598L21.9999 12.9772L22 11L19.6224 10.3954Z" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/icons/square3d-from-center.svg b/src/interface/icons/square3d-from-center.svg
new file mode 100644
index 0000000000..531d99bd76
--- /dev/null
+++ b/src/interface/icons/square3d-from-center.svg
@@ -0,0 +1,4 @@
+<svg width="24" height="24" viewBox="0 0 24 24" stroke-width="1.5" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M3 20.4V3.6C3 3.26863 3.26863 3 3.6 3H20.4C20.7314 3 21 3.26863 21 3.6V20.4C21 20.7314 20.7314 21 20.4 21H3.6C3.26863 21 3 20.7314 3 20.4Z" stroke="currentColor"/>
+<path d="M12 13C12.5523 13 13 12.5523 13 12C13 11.4477 12.5523 11 12 11C11.4477 11 11 11.4477 11 12C11 12.5523 11.4477 13 12 13Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>
diff --git a/src/interface/interface_resources.qrc b/src/interface/interface_resources.qrc
new file mode 100644
index 0000000000..9be3928f7d
--- /dev/null
+++ b/src/interface/interface_resources.qrc
@@ -0,0 +1,59 @@
+<!-- This file was generated with the assistance of an AI coding tool. -->
+<RCC>
+    <qresource prefix="/fonts">
+        <file alias="DMSans-VariableFont_opsz,wght.ttf">../ifctester/webapp/public/fonts/dmsans/DMSans-VariableFont_opsz,wght.ttf</file>
+    </qresource>
+    <qresource prefix="/icons">
+        <file alias="IFC.png">../bonsai/bonsai/bim/data/icons/IFC.png</file>
+        <file alias="dm_add.png">../bonsai/bonsai/bim/data/icons/dm_add.png</file>
+        <file alias="dm_add_type.png">../bonsai/bonsai/bim/data/icons/dm_add_type.png</file>
+        <file alias="dm_assign.png">../bonsai/bonsai/bim/data/icons/dm_assign.png</file>
+        <file alias="dm_centerline.png">../bonsai/bonsai/bim/data/icons/dm_centerline.png</file>
+        <file alias="dm_connect_mep_elements.png">../bonsai/bonsai/bim/data/icons/dm_connect_mep_elements.png</file>
+        <file alias="dm_decomposition.png">../bonsai/bonsai/bim/data/icons/dm_decomposition.png</file>
+        <file alias="dm_edit_profile.png">../bonsai/bonsai/bim/data/icons/dm_edit_profile.png</file>
+        <file alias="dm_ifc.png">../bonsai/bonsai/bim/data/icons/dm_ifc.png</file>
+        <file alias="dm_perform_quantity_take-off.png">../bonsai/bonsai/bim/data/icons/dm_perform_quantity_take-off.png</file>
+        <file alias="dm_rectangle.png">../bonsai/bonsai/bim/data/icons/dm_rectangle.png</file>
+        <file alias="dm_refresh.png">../bonsai/bonsai/bim/data/icons/dm_refresh.png</file>
+        <file alias="dm_rotate_90.png">../bonsai/bonsai/bim/data/icons/dm_rotate_90.png</file>
+        <file alias="dm_split.png">../bonsai/bonsai/bim/data/icons/dm_split.png</file>
+        <file alias="dm_toggle_openings.png">../bonsai/bonsai/bim/data/icons/dm_toggle_openings.png</file>
+        <file alias="plus-square.svg">icons/plus-square.svg</file>
+        <file alias="download-square.svg">icons/download-square.svg</file>
+        <file alias="cloud-square.svg">icons/cloud-square.svg</file>
+        <file alias="clock-rotate-right.svg">icons/clock-rotate-right.svg</file>
+        <file alias="floppy-disk.svg">icons/floppy-disk.svg</file>
+        <file alias="floppy-disk-arrow-in.svg">icons/floppy-disk-arrow-in.svg</file>
+        <file alias="cube.svg">icons/cube.svg</file>
+        <file alias="refresh-double.svg">icons/refresh-double.svg</file>
+        <file alias="settings.svg">icons/settings.svg</file>
+        <file alias="home.svg">icons/home.svg</file>
+        <file alias="home-alt.svg">icons/home-alt.svg</file>
+        <file alias="cube-scan.svg">icons/cube-scan.svg</file>
+        <file alias="cube-scan-solid.svg">icons/cube-scan-solid.svg</file>
+        <file alias="planimetry.svg">icons/planimetry.svg</file>
+        <file alias="city.svg">icons/city.svg</file>
+        <file alias="building.svg">icons/building.svg</file>
+        <file alias="cellar.svg">icons/cellar.svg</file>
+        <file alias="perspective-view.svg">icons/perspective-view.svg</file>
+        <file alias="rotate-camera-right.svg">icons/rotate-camera-right.svg</file>
+        <file alias="drone.svg">icons/drone.svg</file>
+        <file alias="folder-plus.svg">icons/folder-plus.svg</file>
+        <file alias="folder-minus.svg">icons/folder-minus.svg</file>
+        <file alias="folder.svg">icons/folder.svg</file>
+        <file alias="minus-square.svg">icons/minus-square.svg</file>
+        <file alias="eye-closed.svg">icons/eye-closed.svg</file>
+        <file alias="eye.svg">icons/eye.svg</file>
+        <file alias="eye-solid.svg">icons/eye-solid.svg</file>
+        <file alias="intersect.svg">icons/intersect.svg</file>
+        <file alias="select-edge3d.svg">icons/select-edge3d.svg</file>
+        <file alias="select-face3d.svg">icons/select-face3d.svg</file>
+        <file alias="select-point3d.svg">icons/select-point3d.svg</file>
+        <file alias="frame-alt.svg">icons/frame-alt.svg</file>
+        <file alias="square3d-from-center.svg">icons/square3d-from-center.svg</file>
+        <file alias="filter.svg">icons/filter.svg</file>
+        <file alias="cube-dots.svg">icons/cube-dots.svg</file>
+        <file alias="cursor-pointer.svg">icons/cursor-pointer.svg</file>
+    </qresource>
+</RCC>
diff --git a/src/interface/main.cpp b/src/interface/main.cpp
new file mode 100644
index 0000000000..7a1e1d1970
--- /dev/null
+++ b/src/interface/main.cpp
@@ -0,0 +1,77 @@
+// This file was generated with the assistance of an AI coding tool.
+/********************************************************************************
+ *                                                                              *
+ * This file is part of IfcOpenShell.                                           *
+ *                                                                              *
+ * IfcOpenShell is free software: you can redistribute it and/or modify         *
+ * it under the terms of the Lesser GNU General Public License as published by  *
+ * the Free Software Foundation, either version 3.0 of the License, or          *
+ * (at your option) any later version.                                          *
+ *                                                                              *
+ * IfcOpenShell is distributed in the hope that it will be useful,              *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of               *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                 *
+ * Lesser GNU General Public License for more details.                          *
+ *                                                                              *
+ * You should have received a copy of the Lesser GNU General Public License     *
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.         *
+ *                                                                              *
+ ********************************************************************************/
+
+#include "MockMainWindow.h"
+
+#include <QApplication>
+#include <QCommandLineParser>
+#include <QFont>
+#include <QFontDatabase>
+#include <QSurfaceFormat>
+
+namespace {
+
+void installUiFont() {
+    const QString blender_font =
+        "/home/dion/drive/blender/blender-5.1.0-linux-x64/5.1/datafiles/fonts/Inter.woff2";
+
+    int font_id = QFontDatabase::addApplicationFont(blender_font);
+    if (font_id < 0) {
+        font_id = QFontDatabase::addApplicationFont(
+            ":/fonts/DMSans-VariableFont_opsz,wght.ttf");
+    }
+    QString family;
+    if (font_id >= 0) {
+        const QStringList families = QFontDatabase::applicationFontFamilies(font_id);
+        if (!families.isEmpty()) {
+            family = families.front();
+        }
+    }
+    if (!family.isEmpty()) {
+        QApplication::setFont(QFont(family, 10));
+    }
+}
+
+} // namespace
+
+int main(int argc, char* argv[]) {
+    QApplication app(argc, argv);
+    app.setApplicationName("IfcInterfaceMockup");
+    app.setOrganizationName("IfcOpenShell");
+
+    QSurfaceFormat fmt;
+    fmt.setVersion(4, 5);
+    fmt.setProfile(QSurfaceFormat::CoreProfile);
+    fmt.setDepthBufferSize(24);
+    fmt.setSwapBehavior(QSurfaceFormat::DoubleBuffer);
+    fmt.setSamples(4);
+    QSurfaceFormat::setDefaultFormat(fmt);
+
+    QCommandLineParser parser;
+    parser.setApplicationDescription("IfcOpenShell interface mockup with live viewport");
+    parser.addHelpOption();
+    parser.process(app);
+
+    installUiFont();
+
+    MockMainWindow window;
+    window.show();
+    return app.exec();
+}