Just a quick idea to make these boxes water proof. I make strip built wood canoes and kayaks. After the wood work is done I cover them inside and out with epoxy impregnated fiberglass mat. Just get some West Marine epoxy, thin it and roll a coat, let it dry. Drape the top of your box with fiberglass mat and brush on epoxy to wet it out. Work out your bubbles, and let it dry. Then roll on another coat to fill the mat. Might add about $60 bucks to your cost, but it will be tough as nails and water proof. If you are not going to paint it 'cause you like the wood look, just brush on a coat of varnish to keep the epoxy from weathering.
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