Thank you for the links towards Human Powered Boat Here is the following links that I found really helpfull to start my winter project

http://www.wisil.recumbents.com/wisil/h ... _drive.htm

http://www.jemwatercraft.com/pontoon.php

http://www.motherearthnews.com/library/ ... edal_Boat/

Hopefully, if my better-half gives the green light this looks like a father & son project that should provide years of adventure.