Great to have you chime in. I definitely need to chat with Ruben about his SMX screens. It's been a while since I last spoke with him. I know his products are top notch and the attention to detail of his frames is incredible.
Unfortunately that I-Beam has duct work on one side and 3 miles of cable on the other.
All in all, it looks like I'm going to have compromise and give some things up for others. Size of screen, speaker placement, aspect ratios, sound proofing, acoustics, projectors, risers OH MY. Even with a nearly empty room, it's tough to get them all right.
I like the wood treads & riser trim too. I think it helps to break up the theater a bit.
It appears most AT screens recommend 2 - 3" from speaker baffle to back of the screen. So I guess depending on the source, you'll get different answers. I'd be going with a woven screen if I go AT to get down to the 2". I may have to place the speaker right against the wall - compromising in order to get the bigger screen.
The back wall is part of the foundation. So I'm thinking I'll leave a small gap to the foundation, then 2x2, then DD (5/8") & GG. I'm guessing I could then put 1" linacoustic and then the speakers.