I was planning on building a DIY frame for Seymour DIY AT material - but ran across a review of Jamestown Home Theater screens a while ago, and thought "why couldn't I use that inexpensive frame, and replace the material with Seymour AT fabric?". So I contacted Chris Seymour (Seymour A/V) and James Millard (Jamestown HT) to discuss it, and they said it should work.
So I purchased 13' of the Seymour CenterStage XD material, and hired James to build me a custom 136"x64" viewable frame (no material). The material arrived Thursday, and the frame arrived today, so I set about putting it together. Not quite done, but close - still need to paint the center supports with flat black, restretch the fabric, trim the excess "tab" material, and hang the screen. This far took me about 3 1/2 hours today, not hurrying.
The pictures are probably pretty self explanatory - let me know if you have any questions. I'll add some screen shots once the fabric is restretched, and the screen is hung.
Flash shows reflection from center supports; will paint them flat black. No noticeable reflection while watching a few movie clips on it.
Edit: removed prices to protect the innocent (me)