Another trial fit and more trimming. At this point, I've got the final dimension set and sanded to 220 grit on the aft and both lower edges.
I've got to trim the front edge to the correct dimension referenced to the fwd canopy bow, final sand all the edges to relieve stress in the plexi, and account for the frame spread that the canopy will cause when fixed in place. Once all that's done, this thing will hopefully be ready to permanently glue to the frame.
I haven't enjoyed this whole canopy experience, but I'm starting to see the light at the end of the tunnel!