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I'd recommend contacting Moeller and see if they can recommend a tank to fit under the seat. http://moellermarine.com/contact-us/ontact-us/. I contacted them a couple months ago about a tank and they got back to be in less than a day.

Back in the day they made a bench seat that had storage in the back rest. You might be able to find a replacement online.

If you wanted to have some really sharp storage to match the wood, talk to a local wood shop. It will cost more than the traditional plastic stuff they sell but it would look sharp.