I made mine and it was such a PITA only because I was trying to get fancy. I decided I wanted to do a mirror type screen. I forget the name but basically its a mirror that is painted with a home made screen paint and the mirror bounces the light back at the backside of the screen paint increasing the brightness. Problem is I decided to go too big so finding a acrylic mirror that was 5'x9' (122in diag) was hell. I ended up getting a sheet of clear plexi and tried applying that mirror like home window tint to the backside to act like mylar. I screwed it up and ended up painting the backside white then coated the front with a paint I mixed using directions on the AVS forums.
If I had to do it all over again I would have just made a wooden frame, stretched blackout cloth over it and painted the cloth with the same paint I mixed. So much easier and you can get some big sized screens that way. I think we are about to build one for a buddy that is getting his first house.