Update on DIY Projector screen:
I received my Optoma HD66 720p DLP 3D projector a month ago to replace my old PLUS PIANO DLP 480p. Because its HD and brighter contrast ratio, I decided to upgrade my screen from 90" to 120" (59" x 105") diagonal. Once again it's a DIY task and some tips that I got from projectorcentral.com. I started with a couple of 4x8 hardiflex cut into size, nail it to a 67" x 113" wood frame.(4" wider to accomodate the border).
I applied putty to hide the seams, sand till flush. Applied primary flat latex paint using roller brush enough to cover mapping shades caused by the putty. Now the final and most important material, the "satin finish paint". Generously apply the satin paint using a roller brush till you got a uniform shade. Black borders are optional. I ripped 4" wide plywood strips, wrapped it with non-reflective black material (material used to wrap mobile speakers/amplifiers).
I am quite skeptic at first until I fired up the DLP PJ and tested it. Well the screen is much better than the old one I had ( made of cloth material). Blacks are near perfect . My seating distance is about 15-19'. any significant clarity compared to a 1080p is very minimal. Cost to bulid +P2.5k
check out...
http://www.projectorcentral.com/paint_perfect_screen_$100.htm