I'm using AS300-V10 and I'm trying to simulate bedroom ceilings on a one story home that have an additional half inch of drywall that is 12 inches wide around the perimeter of the rooms on the ceiling . Any ideas on how I can accomplish this? Using a half inch floor with a cutout raised up to half an inch under the ceiling or a raised floor acting as a ceiling put the cutout through everything and I see the sky (no roof yet). The center of the rooms ceilings should be a half inch higher than the periphery of the rooms ceilings. The closest I have come is creating a floor the same size as the ceiling and before I complete it I move in 12 inches and draw the center cutout portion and then return to the outer lines parallel to the line going in but not touching. Sort of like drawing a giant bold "C" with the two open ends almost touching. I have to leave a very small gap or I can't add color or materials effectively. Any suggestions on a better way to do it would be most appreciated.