The "foam" idea is not good, as was previously mentioned.
A floating dock is more trouble and expense than it's worth, unless you're building it in a place where you expect significant change in water levels that would damage a fixed deck.
I built a dock and sea wall on Beaver Lake, and did it in the winter. My neighbors thought I was nuts until they saw how much easier it was, and how much more level and square my dock was than mose of theirs were.
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