Nice job CD, thanks for writing it up. What's a BBQ good for without cold beer and ice? Most production boat boxes I've seen are under insulated, specially for the tropics (or Texas for that matter.) I'm hoping on revamping my old ice box (currenty only good for chemical storage) this winter and your experiences will go into the design.
On a simular note: I read an interesting post on the Peterson 44 list where a guy ran his water cooled Adler Barbor H2O intake and exaust to his fresh water tank. I thought this was a briliant idea. No chance of sinking the boat with the fridge and no salt water running through the heat exchanger. 100 gallon or so heat sink. I thought it would be great to add a filter to the system so you are always filtering you're fresh water at the same time.