Well I attached the screen material to the frame and did a quick mounting. Any worries about light bleed through and reflections off of items behind the screen are gone. I can stand behind the frame and see the movie, it is quite bright. I will most likely cover the rear area with dark cloth to just limit extra light. I prefer my theater experience very dark. I did some quick testing and do not see any shadows coming through the screen. The center posts are recessed 1/4 inch back and painted flat black and I do not see any reflections back to the screen. I did not attach the outside trim yet. I just wanted to see if I needed to tweak the fabric, and to my eyes it looks great.
I am running a BenQ W1070 in Cinema Mode with the lamp on Eco setting, and am very happy with the brightness, color and detail. $54 in spandex and I am thrilled. Screen is Milliskin Matte (White) over Milliskin Matte (Light Silver) 122" diagonal. Each step of the way this project exceeds my expectations. I cannot believe I actually took the plunge and started it.
This is a work in progress. So ignore the white walls and myriad of other distracting items around. It is a completely unfinished basement. Add to that a conglomeration of speakers that would make any audiophile's head explode, but to me they sound fine. As time and money are more available, I will get to the speakers. I will get to the ceiling and walls and all the other parts that add up to a nice theater. But for now, I can sit on the old couch and be happy with my setup. I will start a proper thread of my build at some point as I make further progress.