Started with a 2005 basic jon I bought from a friend.He had built a deck on it using 3/4" plywood and pressure treated lumber.Rock solid,but the boat was tremendously bow heavy.I wasn't real happy about some of the things he did,so off it went.I redesigned the new deck using aluminum,and used 1/2" exterior grade plywood(treated with 3 coats of polyurethane).I also added a floor between the seats and carpeted the whole thing.Also added deck latches to gain storage under the deck.Still some things I want to add(outboard,bigger trolling motor,new fish finder/GPS,etc...),but overall I'm happy with it.Got a lot of ideas from this site,so Thank You guys!