What I've been doing on my interior scenes (the ones in the building series I'm doing) is basically making 3 seperate walls and going from there. I tried the hollow cube thing and didn't like the details. I went with terrains for walls because I can use much more detail. I don't even use a back wall on my images if it's not in the picture, much less a ceiling. I've been having a VERY hard time doing ceilings so I opt out and have been going for a downward angle. I'll do ceilings when I'm ready...but for your purposes, I'd use 3 seperate walls, turn off the atmosphere (no skies, dark background) and go from there. This may be against some others' grain here, but I use a radial light to give me a 'working light' so-to-speak. MD