I recently acquired an old fiberglass canoe. I would like to convert it to a flat stern to put a small mud motor on. I'm hoping to use it as a small duck boat. any advice on how this could be done would be greatly appreciated.
You might find http://www.boatdesign.net/forums/diy-marinizing/weed-eater-engine-conversion-1681.html interesting. There is a lot about small mud motors to be found and they are mounted on different types of hulls.
This boat is the best canoe-to-boat build I've seen. He did a hellacious job. I swear the original build thread was on here somewhere, but I only can find the threads that Snooker posted after he bought it. I am probably thinking of another canoe-to-boat project
It isn't a terribly difficult project. Obviously, the one that is linked started as a flatback canoe and ended up a bit higher class than a quick and dirty duckboat build needs to be, but you can infer how the builder worked though the build as you look through the pics. The process for a changing a double ender to a flat back will require a bit more thought, but it will follow the same general concepts. You'll probably lose 10-12" of length.