Home made propane metal smelter?

I would like to build my own homemade propane smelter, to smelt such metals as copper, and aluminum could anyone give me some tips on the best way to go about this creation, where I can get the things I would need to build it, and any other tools, and advice would be great too. I am not looking to do large quantities just something relatively small, for my backyard that I can setup build and use. Thanks!!