|I've had work done by three plastics shops and their work has been uniformly fine. I think many of us are a bit daunted by plexiglass because it's unfamiliar, but to a plastics shop, most of the tasks we present are no more difficult than sawing a 2x4 to length (particularly if you give them the old part as a template).
With the encouragement of a friend, I made a cover over the engine controls, as Clare Jordan did. With that successful, I made a curved cover plate for some old mounting holes in the deckhead. An interesting project. It is advisable to have an understanding (or absent) wife when you put sheets of plastic in her oven.
C&C 27 Mk IV