My high school is doing bye bye birdie. I have computers and 2 projectors that are fairly new. My stage ceiling is 12 foot high. I want to build 2 frames covered with fabric [about 9'x12'wide]. My stage is 20' deep. I want to project different images from the back of the stage through the screen. The actors will perform some of the scenes in front of these screens on the apron. Other scenes will start out by being projected on the screen and then the screens will be pulled back to reveal an interior setting. Has anyone done this? What kind of material do i need to project through? Where can I buy it? Does anyone have a better idea? Would they require special lighting? Would it also function as a scrim?