David, about 6 or 7 years ago I build a 21 foot wood framed canvas covered kayak, I bought the book by George Putz which had the plans and all. What started out as a neat idea ended up taking me 2 years to build. It turned out fantastic. The plans called for cedar strips but being a large person I decided to modify the plans and ended up using ash. it took me awhile but I found someone with long boards. We planed them down to 3/4in thick and then ripped them to 3/4in. The plans called for building forms that were secured to the floor in my garage. basically the boat was built upside down, the strips were temporarily attached to the forms and front and back pieces were made and the strips bent to them and beveled to make smooth ends. then the stringers were fit along the length of the boat. all joints were drilled, countersunk and screwed with non corrosive screws(started with brass but turned to coated due to cost) all the screw heads were filled with epoxy and sanded. eventually the boat was pulled off the forms and turned upright. then the canvas was tacked to the top edges of the framework and stretched tight, an ash keel strip was applied, as were ash bumper rails and an ash cathedral opening. slats were attached in the bottom to sit on. The book called for oil based paint on the canvas to waterproof(I used a UV activated body filler paste that hardened. I used the boat numerous times and eventually traded it(this is the ironic part) to a bow builder from somewhere in Wisconsin, I traded for cash and several bows. I think now that I know how to build bows that he got the better of the deal. I don't recall his name, maybe he's a member of the site. I have pictures and need to scan them to upload, I'll post them so you can see the process I took
good luck on your build.
VB