Here is a Jon Boat conversion for some ideas.http://www.youtube.com/watch?v=WEj3O1JWr08
Good luck. Sound like fun. Keep us updated with pics and process.
There is some pretty wise individuals around here. I'm sure they'll chime in with some suggestions. Hit up Gisteppo
. The man knows his way around a boat. He might have some ideas for easy converstion.
Do a search for his name and then just send him a PM.