A discussion of note, some ‘Q’ flag background, and in the “scary scenario” department…
The biggest problems I see in fixing up old classic plastic is the apparent desire to fix things that don’t need fixing and conforming to what they say a boat should be like.
Take Bill Lapworth’s CAL34 for instance. Lapworth designed a simple, comfortable, and excellent performing cruiser that did the job.

As designed, it’s a great cruiser and the most sensible route to fixing one up is to just accept Lapworth’s design rather than try to emulate what’s currently hip and fashionable. Or in other words, KISS (keep it simple stupid) and, if it ain’t broke, don’t fix it.
The beauty of Bill’s design is that there’s nothing that doesn’t earn its keep and nothing you can do to improve the performance or comfort levels. I know. I tried for years to improve on Lapworth’s design but always came back to the fact that Bill’s way was the best way.
The advantage of working with the OG design is that it’s simple and not going to cost you a lot of money in the process.
Granted, don’t fix it might not apply to those old plaid seat covers…

Our 1977 c&c has yellow and green plaid seat covers and my wife is obsessed with them. (Probably her favorite part of the boat) They are definitely at the end of their useful life though. That Cal looks pretty perfect! (I like me a dinette layout)