Guess there is too much "decorator" in me, but if we had a skylight problem, I think I'd go at it from a different angle. I like the idea of the snaps. Make a stop at your local JoAnn's fabric or Hobby Lobby, etc and get some white fabric backed vinyl. Cut to size and allow enough for a decent hem all around. Invest in some of the heavy snaps - Lowe's/HD or such and the little tool to attach to the frame and corners of the vinyl. The other way to attach is with that indispensable sticky back Velcro. You could just use a small 1" or so piece in the corners and maybe one in the middle or go all the way around, but that would let you remove them when you want to or leave them up. Sorry, but I just can't get excited about a great TT with something to detract from it when it's just as easy to do something that looks nice. No offense intended.