First, an off-topic question.... Google SketchUp?
So, you guys don't think that in a space that size that white walls would have spill issues from the reflected light?
It depends on how far you have your light(s) from the subject and how controlled they are (grids).
I shoot in a small studio (11ft long, 9ft wide, 8 foot ceiling, door on one end so I can shoot further out). My wife would have my balls if I painted the walls black. I find black curtains and panels work just fine.













