Hi Guys, I'm looking to bring home the projector from work and put together a small outdoor movie theater. Sound and projection aspects are already taken care of, but I can't seem to find a cheap alternative for a screen. Now, In a couple of google searches I've seen spandex and like painters drop cloth for materials. Not sure if cheap bed sheets sewn together would cut it. I was wondering what you would suggest for a cheap material. I'm going to have truss for the frame work. Thanks!