Negative thinking will get you no where fast, this forum is to help folks not discourage.
Your idea of building a furnace is a very good one, especially if you have access to plenty of irony aluminum and what to capitalize by cleaning it up. First red flag I see is the scrap yard is going to hesitate on buying your sows, simply bring a drill to drill anywhere into the sow the yard owner would like. The have him bring out the XRF - done deal.
Large sows are poured into large cast iron molds, not stainless steel pots. For the small copper anodes I use a cast iron frying pan, oil it up lightly is that the hot metal makes instant carbon on contact this helps to release the anode when cooled down. You could use your acetylene torch to smoke the surface of the mold, buy hey I'm thrifty.
To make this economical you should find an alternative fuel to heat your sweat furnace.
The attached pdf file may give you further ideas.
http://www.mediafire.com/?znrh279ntc9hsnw
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