Good idea Jimmy,
I hadn't thought about a 16x16. Another good configuration would be 2- 16x16's in a "T" or "L" shape. That would be VERY stable I'd bet.
This maybe a dumb notion, but I wonder if that canned "Great Stuff" insulating foam would work as flotation inside the drums. It may be more expensive than the other foam mentioned, but once it was in there, it wouldn't come out!
Start nailin'!
Dave
