I'm in the process of building a new house. In the basement there is a room that is 17 x 12 x 9 (L x W x D). I want to get a front projector, 100" screen, and 2 rows of seating. Using 1.5 x screen width, that would make the first row 10 feet back. Is 7 feet enough for 2 couches and legroom in between? If not, I can remove a wall and make the room 35x12x9, but my wife has her heart set on a guest suite down there, so that might cause some problems. What is considered the average space used by 2 row seating? Thanks for any help.