diff --git a/src/blenderbim/blenderbim/bim/module/model/__init__.py b/src/blenderbim/blenderbim/bim/module/model/__init__.py
index 3e85b1cf59..0d1553694d 100644
--- a/src/blenderbim/blenderbim/bim/module/model/__init__.py
+++ b/src/blenderbim/blenderbim/bim/module/model/__init__.py
@@ -35,7 +35,10 @@ classes = (
     wall.MergeWall,
     wall.RecalculateWall,
     wall.SplitWall,
+    opening.AddBoolean,
     opening.AddElementOpening,
+    opening.AddPotentialHalfSpaceSolid,
+    opening.AddPotentialOpening,
     profile.ChangeCardinalPoint,
     profile.ChangeProfileDepth,
     profile.ExtendProfile,
@@ -55,9 +58,9 @@ classes = (
     ui.BIM_PT_authoring,
     ui.DisplayConstrTypesUI,
     ui.HelpConstrTypes,
+    ui.BIM_MT_model,
     grid.BIM_OT_add_object,
     stair.BIM_OT_add_object,
-    opening.BIM_OT_add_object,
     pie.OpenPieClass,
     pie.PieUpdateContainer,
     pie.PieAddOpening,
@@ -74,8 +77,7 @@ def register():
     bpy.types.Scene.BIMModelProperties = bpy.props.PointerProperty(type=prop.BIMModelProperties)
     bpy.types.VIEW3D_MT_mesh_add.append(grid.add_object_button)
     bpy.types.VIEW3D_MT_mesh_add.append(stair.add_object_button)
-    bpy.types.VIEW3D_MT_mesh_add.append(opening.add_object_button)
-    bpy.types.VIEW3D_MT_add.append(product.add_empty_type_button)
+    bpy.types.VIEW3D_MT_add.append(ui.add_menu)
     bpy.app.handlers.load_post.append(handler.load_post)
     wm = bpy.context.window_manager
     if wm.keyconfigs.addon:
@@ -92,8 +94,7 @@ def unregister():
     bpy.app.handlers.load_post.remove(handler.load_post)
     bpy.types.VIEW3D_MT_mesh_add.remove(grid.add_object_button)
     bpy.types.VIEW3D_MT_mesh_add.remove(stair.add_object_button)
-    bpy.types.VIEW3D_MT_mesh_add.remove(opening.add_object_button)
-    bpy.types.VIEW3D_MT_add.remove(product.add_empty_type_button)
+    bpy.types.VIEW3D_MT_add.remove(ui.add_menu)
     wm = bpy.context.window_manager
     kc = wm.keyconfigs.addon
     if kc:
diff --git a/src/blenderbim/blenderbim/bim/module/model/opening.py b/src/blenderbim/blenderbim/bim/module/model/opening.py
index a2e994ac84..9accc5951b 100644
--- a/src/blenderbim/blenderbim/bim/module/model/opening.py
+++ b/src/blenderbim/blenderbim/bim/module/model/opening.py
@@ -17,6 +17,8 @@
 # along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
 
 import bpy
+import gpu
+import bgl
 import bmesh
 import blenderbim.bim.handler
 import ifcopenshell
@@ -27,8 +29,11 @@ from blenderbim.bim.ifc import IfcStore
 from math import pi
 from mathutils import Vector
 from bpy.types import Operator
+from bpy.types import SpaceView3D
 from bpy.props import FloatProperty
 from bpy_extras.object_utils import AddObjectHelper, object_data_add
+from gpu.types import GPUShader, GPUBatch, GPUIndexBuf, GPUVertBuf, GPUVertFormat
+from gpu_extras.batch import batch_for_shader
 
 
 def element_listener(element, obj):
@@ -202,6 +207,7 @@ class AddElementOpening(bpy.types.Operator):
 
 
 def add_object(self, context):
+    props = context.scene.BIMModelProperties
     bm = bmesh.new()
     bmesh.ops.create_cube(bm, size=self.size)
     bm.verts.ensure_lookup_table()
@@ -212,20 +218,237 @@ def add_object(self, context):
     bm.free()
     obj = object_data_add(context, mesh, operator=self)
     obj.name = "Opening"
-    obj.display_type = "WIRE"
+
+    has_deleted_opening = True
+    while has_deleted_opening:
+        has_deleted_opening = False
+        for i, opening in enumerate(props.openings):
+            if not opening.obj:
+                props.openings.remove(i)
+                has_deleted_opening = True
+
+    new = props.openings.add()
+    new.obj = obj
+
+    DecorationsHandler.install(context)
 
 
-class BIM_OT_add_object(Operator, AddObjectHelper):
-    bl_idname = "mesh.add_opening"
-    bl_label = "Dumb Opening"
+class AddPotentialOpening(Operator, AddObjectHelper):
+    bl_idname = "bim.add_potential_opening"
+    bl_label = "Add Potential Opening"
     bl_options = {"REGISTER", "UNDO"}
-
-    size: FloatProperty(name="Size", default=2)
+    size: FloatProperty(name="Size", default=0.5)
 
     def execute(self, context):
         add_object(self, context)
         return {"FINISHED"}
 
 
-def add_object_button(self, context):
-    self.layout.operator(BIM_OT_add_object.bl_idname, icon="PLUGIN")
+class AddPotentialHalfSpaceSolid(Operator, AddObjectHelper):
+    bl_idname = "bim.add_potential_half_space_solid"
+    bl_label = "Add Potential Half Space Solid"
+    bl_options = {"REGISTER", "UNDO"}
+
+    def execute(self, context):
+        props = context.scene.BIMModelProperties
+        bm = bmesh.new()
+        bmesh.ops.create_grid(bm, size=0.5)
+        bm.verts.ensure_lookup_table()
+        bm.edges.ensure_lookup_table()
+        bm.faces.ensure_lookup_table()
+        mesh = bpy.data.meshes.new(name="Dumb Opening")
+        bm.to_mesh(mesh)
+        bm.free()
+        obj = object_data_add(context, mesh, operator=self)
+        obj.name = "HalfSpaceSolid"
+
+        has_deleted_opening = True
+        while has_deleted_opening:
+            has_deleted_opening = False
+            for i, opening in enumerate(props.openings):
+                if not opening.obj:
+                    props.openings.remove(i)
+                    has_deleted_opening = True
+
+        new = props.openings.add()
+        new.obj = obj
+
+        DecorationsHandler.install(context)
+        return {"FINISHED"}
+
+
+class AddBoolean(Operator, tool.Ifc.Operator):
+    bl_idname = "bim.add_boolean"
+    bl_label = "Add Boolean"
+    bl_options = {"REGISTER", "UNDO"}
+
+    def _execute(self, context):
+        props = context.scene.BIMModelProperties
+        objs = context.selected_objects
+        if len(objs) != 2:
+            return {"FINISHED"}
+        obj1, obj2 = objs
+        element1 = tool.Ifc.get_entity(obj1)
+        element2 = tool.Ifc.get_entity(obj2)
+        if element1 and element2:
+            return {"FINISHED"}
+        if not element1 and not element2:
+            return {"FINISHED"}
+        if element2 and not element1:
+            obj1, obj2 = obj2, obj1
+        if not obj1.data or not hasattr(obj1.data, "BIMMeshProperties"):
+            return {"FINISHED"}
+        representation = tool.Ifc.get().by_id(obj1.data.BIMMeshProperties.ifc_definition_id)
+
+        ifcopenshell.api.run(
+            "geometry.add_boolean",
+            tool.Ifc.get(),
+            representation=representation,
+            operator="DIFFERENCE",
+            matrix=obj1.matrix_world.inverted() @ obj2.matrix_world,
+        )
+
+        has_deleted_opening = True
+        while has_deleted_opening:
+            has_deleted_opening = False
+            for i, opening in enumerate(props.openings):
+                if not opening.obj:
+                    props.openings.remove(i)
+                    has_deleted_opening = True
+
+        blenderbim.core.geometry.switch_representation(
+            tool.Geometry,
+            obj=obj1,
+            representation=representation,
+            should_reload=True,
+            enable_dynamic_voids=False,
+            is_global=True,
+            should_sync_changes_first=False,
+        )
+        return {"FINISHED"}
+
+
+class DecorationsHandler:
+    installed = None
+
+    @classmethod
+    def install(cls, context):
+        if cls.installed:
+            cls.uninstall()
+        handler = cls()
+        cls.installed = SpaceView3D.draw_handler_add(handler, (context,), "WINDOW", "POST_VIEW")
+
+    @classmethod
+    def uninstall(cls):
+        try:
+            SpaceView3D.draw_handler_remove(cls.installed, "WINDOW")
+        except ValueError:
+            pass
+        cls.installed = None
+
+    def __call__(self, context):
+        bgl.glLineWidth(2)
+        bgl.glPointSize(6)
+        bgl.glEnable(bgl.GL_BLEND)
+        bgl.glEnable(bgl.GL_LINE_SMOOTH)
+
+        for opening in context.scene.BIMModelProperties.openings:
+            obj = opening.obj
+
+            if not obj:
+                continue
+
+            white = (1, 1, 1, 1)
+            white_t = (1, 1, 1, 0.1)
+            green = (0.545, 0.863, 0, 1)
+            red = (1, 0.2, 0.322, 1)
+            red_t = (1, 0.2, 0.322, 0.1)
+            blue = (0.157, 0.565, 1, 1)
+            blue_t = (0.157, 0.565, 1, 0.1)
+            grey = (0.2, 0.2, 0.2, 1)
+
+            self.shader = gpu.shader.from_builtin("3D_UNIFORM_COLOR")
+
+            verts = []
+            selected_edges = []
+            unselected_edges = []
+            selected_vertices = []
+            unselected_vertices = []
+
+            if obj.mode == "EDIT":
+                bm = bmesh.from_edit_mesh(obj.data)
+
+                for vertex in bm.verts:
+                    co = tuple(obj.matrix_world @ vertex.co)
+                    verts.append(co)
+                    if vertex.hide:
+                        continue
+
+                    if vertex.select:
+                        selected_vertices.append(co)
+                    else:
+                        unselected_vertices.append(co)
+
+                for edge in bm.edges:
+                    edge_indices = [v.index for v in edge.verts]
+                    if edge.hide:
+                        continue
+                    if edge.select:
+                        selected_edges.append(edge_indices)
+                    else:
+                        unselected_edges.append(edge_indices)
+
+                batch = batch_for_shader(self.shader, "LINES", {"pos": all_vertices}, indices=unselected_edges)
+                self.shader.bind()
+                self.shader.uniform_float("color", white)
+                batch.draw(self.shader)
+
+                batch = batch_for_shader(self.shader, "LINES", {"pos": all_vertices}, indices=selected_edges)
+                self.shader.uniform_float("color", green)
+                batch.draw(self.shader)
+
+                batch = batch_for_shader(self.shader, "POINTS", {"pos": unselected_vertices})
+                self.shader.uniform_float("color", white)
+                batch.draw(self.shader)
+
+                batch = batch_for_shader(self.shader, "POINTS", {"pos": selected_vertices})
+                self.shader.uniform_float("color", green)
+                batch.draw(self.shader)
+            else:
+                bm = bmesh.new()
+                bm.from_mesh(obj.data)
+
+                verts = [tuple(obj.matrix_world @ v.co) for v in bm.verts]
+                edges = [tuple([v.index for v in e.verts]) for e in bm.edges]
+
+                batch = batch_for_shader(self.shader, "LINES", {"pos": verts}, indices=edges)
+                self.shader.bind()
+                self.shader.uniform_float("color", green if obj in context.selected_objects else blue)
+                batch.draw(self.shader)
+
+            obj.data.calc_loop_triangles()
+            tris = [tuple(t.vertices) for t in obj.data.loop_triangles]
+
+            batch = batch_for_shader(self.shader, "TRIS", {"pos": verts}, indices=tris)
+            self.shader.bind()
+            self.shader.uniform_float("color", blue_t)
+            batch.draw(self.shader)
+
+            if "HalfSpaceSolid" in obj.name:
+                # Arrow shape
+                verts = [
+                    tuple(obj.matrix_world @ Vector((0, 0, 0))),
+                    tuple(obj.matrix_world @ Vector((0, 0, 0.5))),
+                    tuple(obj.matrix_world @ Vector((0.05, 0, 0.45))),
+                    tuple(obj.matrix_world @ Vector((-0.05, 0, 0.45))),
+                    tuple(obj.matrix_world @ Vector((0, 0.05, 0.45))),
+                    tuple(obj.matrix_world @ Vector((0, -0.05, 0.45))),
+                ]
+                edges = [(0, 1), (1, 2), (1, 3), (1, 4), (1, 5)]
+                batch = batch_for_shader(self.shader, "LINES", {"pos": verts}, indices=edges)
+                self.shader.bind()
+                self.shader.uniform_float("color", green if obj in context.selected_objects else blue)
+                batch.draw(self.shader)
+
+            if obj.mode != "EDIT":
+                bm.free()
diff --git a/src/blenderbim/blenderbim/bim/module/model/prop.py b/src/blenderbim/blenderbim/bim/module/model/prop.py
index c531c1a3cb..be5c9c9f68 100644
--- a/src/blenderbim/blenderbim/bim/module/model/prop.py
+++ b/src/blenderbim/blenderbim/bim/module/model/prop.py
@@ -17,6 +17,7 @@
 # along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
 
 import bpy
+from blenderbim.bim.prop import ObjProperty
 from blenderbim.bim.module.model.data import AuthoringData
 from blenderbim.bim.module.model.root import ConstrTypeEntityNotFound
 from bpy.types import PropertyGroup
@@ -178,3 +179,4 @@ class BIMModelProperties(PropertyGroup):
         default="5",
     )
     length: bpy.props.FloatProperty(default=42.0)
+    openings: bpy.props.CollectionProperty(type=ObjProperty)
diff --git a/src/blenderbim/blenderbim/bim/module/model/ui.py b/src/blenderbim/blenderbim/bim/module/model/ui.py
index 2652c9447d..793bc170de 100644
--- a/src/blenderbim/blenderbim/bim/module/model/ui.py
+++ b/src/blenderbim/blenderbim/bim/module/model/ui.py
@@ -17,7 +17,7 @@
 # along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
 
 import bpy
-from bpy.types import Panel, Operator
+from bpy.types import Panel, Operator, Menu
 from blenderbim.bim.module.model.data import AuthoringData
 from blenderbim.bim.helper import prop_with_search, close_operator_panel
 
@@ -153,3 +153,18 @@ class HelpConstrTypes(Operator):
             "The Construction Type Browser allows to preview and add new instances to the model.",
             "For further support, please click on the Documentation link below.",
         ]
+
+
+class BIM_MT_model(Menu):
+    bl_idname = "BIM_MT_model"
+    bl_label = "IFC Objects"
+
+    def draw(self, context):
+        layout = self.layout
+        layout.operator("bim.add_empty_type", text="Empty Type", icon="EMPTY_AXIS")
+        layout.operator("bim.add_potential_half_space_solid", text="Half Space Proxy", icon="ORIENTATION_NORMAL")
+        layout.operator("bim.add_potential_opening", text="Opening Proxy", icon="CUBE")
+
+
+def add_menu(self, context):
+    self.layout.menu("BIM_MT_model", icon="FILE_3D")