The first tusk/canister is now complete, and is shown below on the right. The piece on the left is the casting with the aluminum powder straight out of the mold.
To finish it I sanded, buffed and polished it, then gave it a coating of antiquing. After it dried I screwed in the eight black steel bolts, and attached the coiled wire thingamajiggy on the right. Now it kind of looks like a bomb!