Craig,
If you do a search on e-bay for "O-Clamp", these are clamps made for DJ lighting but work very well for attaching things to the ROPS. I used them to attach my windshield (and other things). If you used 2 of these clamps, you could get a piece of dark tinted plexiglass and either make it so it comes off (the clamps are such that the whole thing could be removed in about 20 seconds) or hinged so it would flip up.
Brian