Updated based on feedback from @brunoperdigao

src/bonsai/bonsai/bim/handler.py

@@ -30,7 +30,7 @@ from bonsai.bim.ifc import IfcStore
 from bonsai.bim.module.model.data import AuthoringData
 from bonsai.bim.module.aggregate.decorator import AggregateDecorator
 from bonsai.bim.module.georeference.decorator import GeoreferenceDecorator
-from bonsai.bim.module.model.decorator import WallAxisDecorator, SlabDirectionDecorator
+from bonsai.bim.module.model.decorator import WallAxisDecorator, SlabDirectionDecorator, BoundingBoxDecorator
 from bonsai.bim.module.nest.decorator import NestDecorator
 from mathutils import Vector
 from math import cos
@@ -409,6 +409,8 @@ def load_post(scene):
         WallAxisDecorator.install(bpy.context)
     if model_props.show_slab_direction:
         SlabDirectionDecorator.install(bpy.context)
+    if model_props.show_bounding_box:
+        BoundingBoxDecorator.install(bpy.context)
 
     if preferences.should_use_snap and (scene := bpy.context.scene):
         # Snapping is off by default in Blender, but in BIM, it's more useful to be on

src/bonsai/bonsai/bim/module/geometry/ui.py

@@ -533,7 +533,7 @@ class BIM_PT_derived_coordinates(Panel):
         area_3d = next((area for area in context.screen.areas if area.type == "VIEW_3D"), None)
         space_3d = next((space for space in area_3d.spaces if space.type == "VIEW_3D"), None)
 
-        if bpy.context.scene.BIMModelProperties.measure_xyz_dimensions:
+        if bpy.context.scene.BIMModelProperties.show_bounding_box:
             for axis, icon, idx in [("X", "STRIP_COLOR_01", 0), ("Y", "STRIP_COLOR_04", 1), ("Z", "STRIP_COLOR_05", 2)]:
                 row.label(text="", icon=icon)
                 row.prop(context.active_object, "dimensions", text=axis, index=idx)

src/bonsai/bonsai/bim/module/model/decorator.py

@@ -21,11 +21,11 @@ import bpy
 import blf
 import bpy
 import gpu
-import gpu_extras
 import bmesh
 import ifcopenshell
 import bonsai.tool as tool
 import math
+import mathutils
 from math import sin, cos, radians
 from bpy.types import SpaceView3D
 from bpy_extras import view3d_utils
@@ -36,6 +36,7 @@ from typing import Union
 from bonsai.bim.module.drawing.helper import format_distance
 from itertools import chain
 from typing import Union, Any
+from bpy_extras.view3d_utils import location_3d_to_region_2d
 
 
 def transparent_color(color, alpha=0.1):
@@ -1165,7 +1166,6 @@ class BoundingBoxDecorator:
 
     @staticmethod
     def get_combined_bounding_box_corners(objects):
-        import mathutils
 
         if not objects:
             return None, None, None
@@ -1216,7 +1216,6 @@ class BoundingBoxDecorator:
 
     @staticmethod
     def find_closest_trihedron(corners, edges, region, rv3d):
-        from bpy_extras.view3d_utils import location_3d_to_region_2d
 
         min_y = float("inf")
         best_origin = None
@@ -1259,8 +1258,7 @@ class BoundingBoxDecorator:
         self.draw_batch("TRIS", verts, color, [(0, 1, 2), (1, 2, 3)])
 
     def draw_bounding_box_wire_cube(self, context):
-        import gpu
-        from gpu_extras.batch import batch_for_shader
+
 
         self.line_shader = gpu.shader.from_builtin("POLYLINE_UNIFORM_COLOR")
         self.line_shader.bind()
@@ -1285,11 +1283,6 @@ class BoundingBoxDecorator:
                 self.draw_batch("LINES", [corners[i1], corners[i2]], color)
 
     def draw_dimension_text(self, context):
-        from bpy_extras.view3d_utils import location_3d_to_region_2d
-        from bonsai.bim.module.drawing.helper import format_distance
-        import mathutils
-        import blf
-
         self.line_shader = gpu.shader.from_builtin("POLYLINE_UNIFORM_COLOR")
         self.line_shader.bind()
         self.line_shader.uniform_float("viewportSize", (context.region.width, context.region.height))

src/bonsai/bonsai/bim/module/model/prop.py

@@ -119,7 +119,7 @@ def update_measure_xyz(self: "BIMModelProperties", context: bpy.types.Context) -
     space_3d = next((space for space in area_3d.spaces if space.type == "VIEW_3D"), None) if area_3d else None
     scene = context.scene
 
-    if self.measure_xyz_dimensions:
+    if self.show_bounding_box:
         BoundingBoxDecorator.install(context)
         # Save previous state if not already saved
         if not self.prev_transform_orientation_slot_type:
@@ -286,7 +286,7 @@ class BIMModelProperties(PropertyGroup):
     prev_transform_orientation_slot_type: bpy.props.StringProperty(name="Previous Gizmo Orientation Type")
     prev_show_gizmo_object_translate: bpy.props.BoolProperty(name="Previous Gizmo Translate")
 
-    measure_xyz_dimensions: bpy.props.BoolProperty(
+    show_bounding_box: bpy.props.BoolProperty(
         name="Measure XYZ Dimensions",
         default=False,
         update=update_measure_xyz

src/bonsai/bonsai/bim/ui.py

@@ -1334,7 +1334,7 @@ class BIM_PT_decorators_overlay(Panel):
         row = col.row(align=True)
         row.prop(model_props, "show_slab_direction", text="Slab Direction")
         row = col.row(align=True)
-        row.prop(model_props, "measure_xyz_dimensions", text="Bounding Box Dimensions")      
+        row.prop(model_props, "show_bounding_box", text="Bounding Box Dimensions")      
         row = col.row(align=True)
         row.prop(model_props, "show_cut_decorator", text="Cut Decorator")
         row.prop(model_props, "show_cut_decorator_fill", text="Fill Cut Decorator")