I love to do interiors. Often I just build 2 (maybe 3) walls (I just use the rectangle and shape it the way I want it, duplicate it-rotate the dupes 90 degrees or whatever as stated above), a ceiling and floor and go from there--like a photo set. Add your doors, windows boolean method. If you want to shoot from various angles, then you will have to add the enclosing walls. Bone, I noted you using symmetrical lattices--any advantage to that? Diane B