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So I'm playing on version 0.0.7 and here's what I have found.
1) You can sell weapons made with Heated parts (so make the blade/hammer head and don't cool it). It sells for the exact same price as a cooled weapon.

2) Certain ingots turn into weapon parts of different metals. (need to test some more to see which ones do this exactly)

3) The game's great fun!