I recently built my own projector screen. I documented the process process in quite a lot of detail here if you are interested. As the projector screen is infront of a doorway it needs to be retractable. I would have rathered a sheet of MDF or a stretched fabric screen but that would have been difficult to install. After much thought I decided to go with ticking rather than blackout material as it is a heavy fabric but more flexible and so it rolls up more easily. Now that the screen has been hanging for a month or so all the creases are gone and it is close to as good as a streached fabric screen. My one remaining problem designing a system to retract it. I have tried a rope pully but I can't get enough friction between the rope and the driven pully. I am thinking of maybe a chain drive system but that seems like a lot of work. Alternativly I could butcher an old roller blind but to be quite honest I think the pully systems on most of them look ugly. Any ideas?