1.9:1 is the maximum i could fit in my space, vertically and horizontally, approximately, it's really closer to 2:1 like yours if I go as wide as possible. I'm restricted by height, as my ceiling is only 7.5' high. With 27" for center channel and stand, that leaves 57" + 6" to the ceiling. However, the frame sizes on the Stewart masking screens are pretty wide, at least 10". So I'd have to move it down to about 54" and have the frame right up against the ceiling.
I spoke with a guy at Stewart the other day, and he was saying unless you buy their variable masking technology, which is WAY out of my price range, I should go with either 1.78:1 or 2.35:1. And then spring for the vertical or horizontal masking if I wanted to really minimize the impact of the bars. He was fairly adamant about not having bars on both resolutions.
I also spoke to the 4K rep from Sony, and he thought that 1.78:1 is the best way to go, and when watching cinemascope content, the bars really aren't noticeable, especially in a really dark room. DaLite has a variable masking screen that is around 4K (without the screen), but I don't know much about their screens, I'm really set on the StudioTek 130.
It's all very confusing, hard to decide. I have a 2.35:1 area marked on my wall with string, it's the absolute maximum width I can go, probably too wide for 13' viewing distance, but it would give me a fairly large (100" diagonal) 16:9.
Can you post those links, i'd love to see. Her is my wall, 2.35:1 marked off, 115" wide. the 16:9 inside is 100" diagonal. In order to get the 2.35:1 size I really want for movies, which is the main reason I'm building this in the first place, I'd have to have a really huge 16:9 screen. So I'm leaning 2.35 (unless I win the lottery and spring for the Stewart variable masking).