Hey! Search noob. This has been covered before. (Joking with ya, but seriously...)
(Oh yeah, first blood baby)
Quick search turned up this thread: Homemade Projector Info:
So the image doesn't get washed out or faded by the intense light from the projector? Wow... that's neato!
So much for wanting to source a used LightPro. Sheesh, we throw those overhead projectors out every year in exchange for newer LightPro's too. Will have to re-think that at end of fiscal year.
Let me end by asking a noob question. Is the presentation reversed - left is right and right is left?