Thats exactly what i was planning to do, I was planning to use the smaller wall (15 x 11) for the background, the reason I need the green screen is to use on small indy type projects, like short films, and general practice and experimentation, before I move on to a bigger permanent place a coule of years down the road, for that purpose I think the size would do just fine. Do you agree?
The reason I want to use paint and cycs and all that instead of a backdrop, is that the experimentation and building process is a big part of my goal, and because someone else is paying so to some extent money and effort are not a problem.
Those were my initial thoughts but ofcourse I'm not stuck on them, i'm here for advice.