Thanks Tyren, for pioneering this movement!
You have me so fired up that I too have been making pens and building projector mockups.
You mentioned wax paper and then some film for the top - in my mockup, I was very surprised how well a thin white bed sheet worked too. I was able to read stuff without problem. I have not tested any other materials yet so I will definately be visiting the crafts store (if I am lucky enough to have a similar setup).
Great job and thanks!
Here was my discussion:viewtopic.php?f=6&t=8827