Only *practical* way to go with floats. Looking through the TCDS
for my Cherokee, I ran across the obscure model PA-28S-160 and
PA-28S-180.... A hershey-bar cherokee on floats. I managed to find a
picture of one... funky.
-Cory
Try an RV-6 on floats...
http://www.vansaircraft.com/public/amphib.htm