Mine is under my garage; very sweet and a huge success with my kids teenage friends!
No windows, some acoustic treatments; you can play a movie at full throttle and you can't hear it in the rest of the house; perfect for Dad's midnight movie madness!
Nice Job BTW, I like the comment about the stewardess; kinda looks like a jet fuselage.
Pics:
This is the main floor family room set up: (needs paint & flooring still)