I discovered some things in Lightwave again, and made some new buildings. I noticed that with a single layer of vertices, there is bound to be some light coming through in TG. I always had a bit trouble to get the inside of houses really dark. Extruding an inner layer is interesting to build the inside of a house (though I might not use that), but also for that light seepage.
So, when finished I put a scene together to test the house (Stone Age). Roof isn't mapped, but textured procedurally, walls partially image map (wicker), partially procedural (loam). I also had trouble UV mapping those rounded areas, so this works great.