We have a project in the early stages. After laying out walls, doors, furniture, rooms, etc, we've been told we need a 6" high raised access floor throughout about half the building. About half of the interior walls will be de-mountable partitions so will need to sit on top of the raised access floor. When I create the raised access floor and move the walls so the bottom constraint is the raised access floor, I lose all of my rooms.

I'm trying to figure out the best way to handle this before we get too far down the road. Is it better to have the raised access set to its own level or offset off the main floor level? How do I deal with rooms? I would rather not have two different floor plans with the access floor being only 6" above the main floor.

What's the best way to deal with this?

Thanks.