How do you know what that vessel is doing? I have walked and climbed hundreds if not thousands of ships' tanks and voids with the American Bureau of Ships reps... there is all manner of issues with a vessel that size. Saying that is like judging a book by it's cover.

All I am doing is pointing out the pitfalls of using aluminum on salt water. A good many aluminum power boat makers will tell you that sea water usage will void portions of their warrantee. Trition is one that will not warrantee a boat in salt water. But hey... they only design and make the things.

Note too... the flat surfaces on this vessel... aluminum does not form well compared to other metals.

But if you are determined to do it... good luck.