Now that we have seen the physical problems with the boat, what are the specific problems with the engine?
Once we read the specific problems with the engine, what are the problems that the combined annoyances created to stop one from enjoying sailing?
I had big problems with Nice Aft when I got her. The difference in this case was not the dealer shirking his/her responsibilities, but his designated outfitter not doing a good job. Leaks (from the installed ports), & wiring problems. The dealer came through with gold stars. In the scenario which we are reading here, the dealer may not be acting in good faith. Then it becomes necessary to enlist legal help. Has this happened?
When my nephew was two he had a bib that said "SPIT HAPPENS". It does, but how you clean it up makes a big difference. Sometimes you have to take big steps. Teddy Roosevelt said "walk softly, but carry a big stick"
I don't know about now, but a good threat to the dealer may have been (ask a lawyer) to tell him/her that you are going to report your problems to different Internet groups in the hope of finding a solution. If the dealer name happens to come up, well, "I wasn't complaining, I was just explaining certain problems with fiberglass & other things, and was just inquiring how to rectify certain problems from
people who are interested in boats"

A local paper may be interested? The BBB definitely should be involved.
If you feel that you have been wronged; do something about it!
If you've done all of that, then, in the words of Rosann Rosannadanna, Never mind!
If you haven't, well it may not be to late to start. It's cold outside in the east, but a good picket line with friends can start getting much attention.
Ray