Gotcha. Our garage has the double wide door so I don't have to deal with the rails. If the door ever gets destroyed I'm going to look at a roller door with a side opener.
Gotcha. I don't have a projector at all and hang a net up. I use my laptop plugged into the TV I hung on the wall and it works for me. But, I am planning to upgrade to a mini PC, short throw projector and screen this year. You said you have a 2 car garage and a short throw projector works well...