This sounds like a really fun treasure hunt!
With perseverance and optimism, you will stumble on the right person with the info you need at the right time.
Try emailing a
short, easy to read flyer to all of the restoration outfits you can think of.
Im assuming there are people that have the leads that are not on the forum so you might even have to pound pavement as perhaps some may simply not do even email.
Have you talked to the NH boat museum, Scott Hayes, Mark Mason, Jeff Fay, Bob Valpie (pardon me if I misspelled the name) Bo Muller over in Sunapee? Just these people alone probably have info running as deep as Marianas trench.
Bound to be someone out there with additional nuggets of info.. this is just NH, try running out to bordering outfits in the neighboring states.
I know of two stories where folks have searched for cars and boats .. both have found what they were looking for
Better to fail knowing you tried to succeed than to not try at all.
in time, you will find it.
eyes on the prize