Looks great ke3. I'd check to see whether you need the toe in on the front speakers. I like the position of your side surrounds just aft of the seating position. The back surrounds may work better if you move them closer together. Not easy to move them around to see what works best. Your sub position is interesting. You may want to put a giant SVS next to the water heater. 20 Hz material should go right through that wall. Just kidding. For some reason that room looks like it needs a second sub.

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.