Don't forget to move your seating forward a bit too. If you like that big image, then you end up with the picture filling your vision, but
the image doesn't end up so close to the room boundaries. And if you can keep those boundaries so they absorb light coming off the screen,
then you don't actually kill your projector's contrast ratio. Most home theater designers will suggest using a ratio to around 80%, of the front
wall as screen.
Why can't that door be on the wall running perpendicular to the side wall of the theater? Or if it needs to be right where it is, does it need to be a
30" door? Would a 24" door do, and allow you to shrink the AT space depth, and park the extra 6" on the people side the AT screen wall?
Moving the seating forward, will give also give you more separation from the rear surrounds. And your seating needs are simple, so your room is
luxuriously spacious, so the small decisions can really start to add up, and you could really maximize the picture quality and sound quality out of
If that were my space, I would start designing with thinking, I'd like to be seated around 11-12' off an AT screen. Then I would be looking at the viewing angle,
and trying to duplicate that, with maybe a little bit more relaxed number, as everyone else might not physically enjoy the push of the viewing angle. That would
shrink the screen size, up the pj's brightness, and if you moved that utility closet door outside the room. Then the AT space could produce some wiggle room, and
the depth could be dropped to 27-30". That gain could go behind the seating, and all that would improve the audio, with sit pretty for throw distances, for speakers.
You also might go to Projector Central and check out their projector calculator, and punch in a screen gain of .9 And don't forget to factor in some bulb wear because
the numbers the calculator will spit out, are fresh bulb numbers.