I sent an e-mail to Chuck at the address listed on DuckWorks web site. I got a reply about screening for spam, went through the screening process...
I appreciate all of the input. I have continued my efforts at tracking down designers and/or licensing/patent/copyrights etc., with little result....
I have started a boat building company and have been inspired by old designs. There are many of these designs found on the internet, some 40-50...