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make a /cooler/storage compartment. Think about access hatch rather than inspection port. put a through hull in the bottom so you can put a plug from the inside. Make a bulk head in tank cavity but leave a slight gap in the bottom so the whole cavity can drain when the plug is pulled. you can buy the snap together through hulls cheap. a piece of star board or the likes for one side of the newly formed compartment and a access hatch, your in business. when not in the water you can pull the plug open the hatch and let it air out. If well thought out this would make a live well or at least hold fish on Ice.