If you'd like a second opinion, don't. It's much more important to stop the water from getting in to start with. Pay close attention to where pushrods leave the fuse, where fuel lines go through the firewall, use a charge jack that is sealed, use a wire to turn the switch on, seal the wing to the fuse. Use silicon sealant for most items, if you have a hatch seal it with sealant if you don't need to get into it often or use tape or 1/2" wide strips of clear monokote if you need to get in more often.
Flipstart, do you fly floats? One of the clubs there in Knoxville has a float fly every six months, at a park on the river south west of you, here link to a map of the place. I went last year, they had a pretty good turn out. We, in Charlotte fly floats alot but that might be too far for you to go. Hope the link works.
http://www.mapquest.com/maps/map.adp...bmit=Get%20Map