Screen calculator tells me that a 120" 16:9 diagonal screen is ~105w x 59h. So, if you want a bigger screen than that, you have to get something besides the Wilsonart. But, dude, more than ~9 feet wide?!?!

Nick, I've typed and deleted something like this a few times now. You are a good friend. I think your buddy that wants 1.3+ gain, 120"+, cheap, easy, no-paint, DIY is asking "too much" of life.

bibere usque ad hilaritatem