The first thing that came to mind when I started reading the "insurance problem" posts was "what about a co-op".
I bought a '71
Formosa that is being completely refitted. New
deck, new copper coat, new
motor,
electrical,
plumbing, etc., etc. It's basically, a
new boat but insurance companies and
marinas will consider it a 50 year old. I haven't had to worry about insurance until now (although I should have been thinking about it from the beginning

) and after just a bit of reading it's beginning to scare me.
A co-op sounds attractive and there may be enough interest to make it just barely feasible. But it would still have to have a
core of full-time employees and skilled personel to run it properly.
So, I'm now in the process of reading through ALL the pages on this post. Hopefully, all my concerns are answered herein.
If it happens, I'll be one of the first customers!