I made a cooler that goes in the pocket of my belly boat. Been using it for years. This thing works GREAT! thought I'd brag about it a little. I made a video on how to make one, and put it on you tube. now when my buddies ask me to make one for thier belly boat, I just send them the link! Check this out. Let me know what you think about it. I hope the following link work for you. If not, just type in
"belly boat cooler" in you tube.

http://www.youtube.com/watch?v=l-J8qdW92kE

I'm really psyched about finding a forum on 'belly boating'. Not too many out there. I have a phony belly boating club here in mid-mo. It's more or less just an excuse to get with my fishing buddies. I even bought a domain and made a web page.
www.rockyforkyachtclub.com
Good thing to keep me in the belly boating mind during the winter months!

nice job.

heres also a good forum

http://www.bigfishtackle.com/forum/Float_Tube_Fishing_C66/

looks great...