I'm very curious about the HVAC setup. A/C is, of course, of the utmost importance here in AZ. My previous sorta-theater was hot as hades during the summer and so I'm trying to gather as much info as possible to do it right, in my (upcoming) new one.
As far as I can tell, you have an intake vent in the back corner and then two flex-duct outflow vents on each side of the room, roughly in line with the door? Am I reading that setup correctly?
Is this part of an existing zone, or did you create a separate dedicated one for the theater? If separate, is it done via electric dampers or via its own A/C unit?
If it's part of an existing zone, then how well does it track the temperature outside the room? That is, does it get significantly hotter in the theater when a bunch of people are in there?