I'm also in the market for a new projector. I went to B&H to see the 900 right next to the Z4, but it wasn't a fair comparison b/c the screens were different. I'm pretty set on the Z4 and a DIY screen. I have about 35 sheets of 1/2" birch plywood....can I use this or should I pick up a sheet of MDF, Gatorboard, etc?