This is the reason I never built a traditional boat. They are built by eye, not by plans (for the most part). There isn't a good easy way to build two exactly alike boats. Fuselage frame may not be identical but they will be extremely close.
And no, no longer doing classes. Last one I tried to put together all but one student backed out. Just hard to put on a class for a price people are willing to pay. So I sold off all the tools and supplied I used in the classes.