If you go Redwing just be sure to make sure you have room for the steering and control cables. That well is pretty tight on the RW18.
This looks like a do-able design. (St)itch and Glue. http://www.cmdboats.com/rb40.htm?cart_id=dcbcf95d8babdba8268a2287d8819cb6
Check out Karl Stambaugh design, He may be able to help with the propulsion details,...