Cool idea. And shapeways is a great source for unsual parts - I've got a few I'll use here. Don't tell anybody, but those coal boards aren't soldered. With a good quality CA, I attached a brass gusset strip to the inside of the curved piece (flattened on the bottom), and then glued the piece to the inside of the bunker. It's strong enough to be handled, and like you said with coal you'll never see inside.
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