Bigd23,
I have been thinking of the same thing. Nothing fancy, heavy, expensive, give shade, shed rain, and be easily removable. I have made several roofs/canopies on my tripod deer stands out of the 3/4" heavy walled PVC pipe, PVC fittings...and thinking doing something along those lines on the tractor. On the deer stands, I cut some heavy truck tarp material to fit and tie wrapped it to the PVC pipe framework I made up.
I figure I would make a squarish frame out of the PVC pipe and fittings with two support legs on the back. The frame and legs could be hose clamped to the rops frame. On those legs, a couple 45 degree angle fittings glued in place, (pipe inserted), which would go up to the front top edge portion, (45 degree fittings inserted in the top edge frame), to support the weight of the front of the shade.
Take off the hose clamps to remove, (or use tie wraps). If you break it, glue the break with a PVC connector fitting. Or if you need to take it off more often, possibly a pipe that would slide inside the PVC, hole drilled and pinned. Just pull the pin and lift the canopy off, type of deal. The pipe would be hose clamped more or less permanently, then.
Works with the deer stands...Why not the tractor? Opinions?