Okay, I called up Stewart earlier and good news, my original order for the GrayHawk was cancelled. I forgot the name of the gentleman that I spoke to but he even spoke about this thread. I was suprised. "Wait, you're from New York and you have a MF1 on the way. I read your post on avsforums." Great guy to deal with. Very helpful. I asked for the screen dimensions and I'm going with a Stewart StudioTek 130 @ 2.35:1 @ 130" diag.
I also called Meridian/Faroudja and the gentleman there said that 130" is about max. After that I'd start to lose a bit too much brightness but 130" should be alright. Very helpful man as well.
Mr. Phelps, you asked to know about the width of my screen. The viewable width is 119.5" and the height is 51". It will be flat.