Thanks for everyone's help and suggestions. I went ahead and purchased the formed Plexiglas rear window and picked it up yesterday from Airplane Plastics in Tipp City, OH. Jeff at AP mentioned that Loctite is death for Lexan and Plexiglas, so now I know to first, don't drip any and second, clean it up completely right away when I do. Now to figure out how to remove the screws without messing up the paint and how to peal off the old window from the pro-seal.
Thanks again, MJ