Thanks guys! HopefulFred, that wall is made of a single row of normal sized bricks. I had enough thickness in the drywall/stud construction that was there previously to go ahead with regular bricks.
As far as the hardwood goes for the theater, I'm probably going to put a small area rug underneath seating in front of the riser. I hope that having people in front of the riser will kill the floor bounce for the back seats. As for the front seats, I'll likely use a reflector that sits on the floor to bounce sound back to the screen wall which will be heavily damped. At the very least, this will delay those reflections, hopefully 10ms or more. I'm going to try a similar technique for the ceiling.