In reference to melting aluminum, I found something that worked when I was bored. I welded two pieces of angle iron together (1/8") and welded a piece of 1/4" plate on the bottom. It was welded so that it was watertight (or metaltight in this case). I also weld two handles onto it. This was a very bad idea, make sure you use tongs, if at all possible, as it not easy to grip one of the handles for very long, even with welding gloves on. Anyway back to the melting. I made a fire out of driftwood (I was along a creek) and walnut (very fun to chop with an axe) on top of a large stone (probably about 2' x 3 1/2'). I just set the so called crucible on top of the coals, and let it sit there for about 45 minutes-hour and melted pop cans, and one ball of aluminum foil. If you melt pop cans, the ink on them will catch on fire, and probably makes some extra impurities in the aluminum for you. Anyhow thats my two cents.
-Hollon