I was thinking of using a 1/8" bathroom type mirror (just much bigger). These are different from acrylic ones, right? If so, would it work just as well? I imagine it would be heavier, and harder to mount.
Light Fusion seems like it costs more (mirror vs Sintra), and is much more difficult to paint correctly. So, I may just go with Sintra. But, I'm one of those weirdos who likes the best, and it might bug me to not do the Light Fusion. And, it would help a lot with the ambient light situation, correct? The projector I'm leaning towards is the BenQ W1200.