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It would be very easy to build an SPL setup in a boat much like a car, that would rattle your teeth out. Right enclosure and right amp and tuning, and you're there. It would likely be a one note...

The trays are deep enough to hold all the life jackets, ropes, buoys you would need and you can still access them when the ballast is full or empty. Again, I have used other boats with "subfloor"...