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Floater, for what its worth I have the tank out of my 1979 22' Revenge and I plan to build a frame out of composite lumber to secure it in place. Whenever I need to remove the tank, I'll simply need to lift out the framework.

Personally I would not put anything that would absorb and retain moisture under the deck.

Not sure how your boat is designed but there was not originally a low drain connecting the coffin to the fish locker that is just downstream. The only coffin drains were just below the deck. The idea was the water would collect on top of the tank and then drain into the fish locker. Good theory but most of the water would find its way to the bottom of the coffin and get stuck there.

IF you do not have a low drain connecting the coffin to the fish locker or engine well you might take the opportunity to create one now. Otherwise you will quickly have standing water in your fuel tank coffin and it won't have any way to escape.

Good Luck

John