Hmmmmmm. It would be nice to keep a membership roster with the canoes in their possession for these reference needs.
It's an intriguing idea, but a very lofty one. As with many organizations, there are always a limited number of "doers" who can or will step up to take on such initiatives.
I am personally grateful to Benson for responding to my suggestion to maintain the files that are contained in classified adds. I had made that suggestion several times before Benson graciously took on the task, I have used several saved images recently. It is noteworthy that they are also benefiting you for your search. I hope that there are others also using this resource.
Tracking WCHA canoes...that would be a daunting task. Very few members use this forum on a regular basis. I can think of only a handful of our local members who participate here. The ones who do might be willing to contribute but that still leaves a significant void.
As you may have recently noticed, many of us do keep a loose catalogue of interesting canoes and where they are. For every member who responds to research or technical questions, there are many more who do not.
Thank you very much for answering my questions about your SLBW canoe. Of the 7 other persons I reached out to, only one other opted to reply.
There is the nut that will be so hard to crack. Some (as Jody recently did) will share their collections. Others will not. It's been my experience that folks who are participants here are also those who are most likely to offer information. Michael Grace has measured things for me more than once as have Jody and others....
I suppose the argument could be that something is better than nothing but let's keep things in perspective. Often, when we are able to find some information about a builder's methods it is work from a "common" builder. The question about how Old Town tied the stem and rails has been asked hundreds of times. That is not true for more obscure builders.
Further complicating, many of the boats we have in queue for restoration suffer (as yours apparently does) from previous restoration freestyling repairs. We may not be any more able to offer the correct answer than you are.
That said, go with your instincts and odds are you will probably get it close enough to right. If someone else sees flaw in your work, they can change it during the next restoration.