I have a screen that is 30 feet wide and 17 feet tall. I would like to make it rear projection, but I cannot find a projector that could project that large. Someone told me to hook multiple projectors up, but I cannot find any info on how to do it, if it's even possible. I have about 15 feet behind the screen. Is there a projector that could project that big from the rear, or do I need to look for a something else?

you might have better luck in the actual projector forum.