Just saw your other thread about cutting up the floor and checking fuel tank.
http://www.classicseacraft.com/commu...ad.php?t=29602
This is what I did to mine to give you ideas about what you could do to yours. The changes I made to mine greatly improved the boats ride quality, gave me tons of under deck storage, brought the boats CG much further forward than the original layout, made space for an easily accessible bilge area, and raised the floor in the back so it stays dry. All that said, most of these improvements can be made without changing the original stringers, and I wouldn't change them unless you really have to or really want to for the under deck storage.