You could also carve a "mold" out of styrofoam, spray it with mold release and then glass over it to make a nice, fairly good looking fiberglass box for the interior of the icebox. You could even mold in a drain and such into the fiberglass. It wouldn't be that hard to do, and would be fairly strong, especially if you laminate the foam to the exterior and glass over the whole thing again...
BTW, a friend did this and we glassed in a PVC pipe for the drain to the refrigerator and installed a drain plug from a sailing dinghy, like this one, for the drain:
If you're planning to make it upgradeable, you could glass in some PVC pipe to make openings to run the copper pipe through for when you decide to upgrade to a refrigerated unit, and then back fill the PVC pipes with either expanding foam or styrofoam that is cut to fit.
It is a pretty simple project and would give you some good experience with fiberglassing and epoxy... and that is never a bad thing on a GRP boat.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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