I replaced my sliding Plex
My sliding hatch started to look very bad after 20-yrs, so I took it off and disassembled it. Took the old piece of smoaked plexiglass to my friendly plastic dealer in town and they cut a piece the same size. I used all the old trim (for the most part)and reassembled it. Once I screwed the teak frame to the plex it took the curve shape without any problem. It has been on for one season, and has performed very well.