Drawing a large scale interior
1. Prepare a
multi-subobject material for the building. ie. walls, windows, floors,
glass, ceiling etc.
2. Import the building Autocad drawing, group and freeze
it.
3. Start by tracing a line following the building contour.
4. Work with the segment subobject and divide/refine each line segment to reflect
the number of windows on it.

5. Extrude spline
and make the segment = 3. The polygons in the middle will be the building's
windows.

6. Convert to
poly, flip normals and create a camera inside. Assign the material ID onto
the walls, ceiling and floor first.

Flip normal
Camera view
7. Select the
polygons for window and deselect any of the walls. Assign material ID
of the selected
polygons in the middle = 4 ( from the material
ID 4 = window frame) and adjust their height, following the window's size
and then inset them all, using by polygon type. This is to create the width
of all windows.

Select polygons in the middle and assign Material ID

Inset to create the width of every window frame.
8. Create frame's
thickness by extruding the polygons and change the ID to 5, that is glass.
9. Select polygons and apply UVWmap on ceiling, floor etc.
10. Create columns and building core using the same polygon technique.
11. Place some lights into the scene.

Now you have prepared a scene that is ready to add in the furniture and
design and runing a walkthrough. I am quite sure if you are familier with
this technique.
You shouldn't spend more 2 hours on the modeling and lighting.
