location and structural dilemmas

As I am planning to create a large curved corridor through which viewers will walk, I was presented with the dilemma of creating some sort of curved frame from which to hang the curtains/screen.  But I may have found a solution to the problem that does not include creating a frame at all.  If I can gain permission to use the rotunda of Shafer, I can use the pre-existing curve on the ceiling in order to hang the "screen."  The walls are not perfectly flat, so unfortunately, I cannot hang the "screen" against them.  But the ceiling, interestingly, has a curved ledge.  In terms of my project, I see two functions for this ledge: 1) as a place to install the projectors; and 2) as a place from which to hang the "screen."  Unfortunately, I cannot do this with the same efficiency as a child builds a fort from blankets, simply placing heavy objects on top of the sheet's end to hold it in place.  This would be insecure and dangerous.  So my new dilemma is to find a way to attach the "screen" to that ledge without causing damage to the ceiling (or the viewers!).