Something like this?

Your post took me down memory lane back to the days when I made Super-8 movies and projected them for my friends in high-school. So, I decided to attack a projection screen, but couldn't spend more than 15 minutes at it. This is what I came up with.

The thing that holds the screen when rolled up is a spline object -- a "C" shape that I extruded. I built the end caps in the spline modeler, too. The rest of the stuff was quick and dirty vertex models or primitives.

I'd be happy to send you the Carrara file, not that it's anything all that detailed.

Hope this is helpful!

• dEX