I'm about to break ground on a new house which will have a dedicated home theater. Currently, the plans call for a 15' x 12' room, which should theoretically give me enough room for a 100" screen (front projector) and a couple of feet behind me for rear sound space. I calculated this using the viewing distance = 1.5x diagonal screen size, which puts the ideal viewing distance at 12.5' (giving me 2.5' for rear sound space). My question: Have I missed anything? I've run the dimensions by a couple of people that think this is too small (the 15' side, that is). I'd love to get the opinions of those here, especially since the plans go "gold" tomorrow. Thanks!