Personally, I'd use aluminum and form it into a long tube. Weld the seams using a gas tungsten arc welder. Then cut the tubes in half to get two tubes. Then you'll have a good platform to attach a deck. The tubes will have the lowest friction coefficient.
Otherwise, just use polypropylene rope and fasten your flotation devices together like Gilligan's Island would do.
Good luck.
Gotta use what I have. Though I like the idea. And all I have is a stick welder that I use like a 6 year old.
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