More permanent processing structures would be cool...

[zambies1]

Is there a mod for more processing structures, like a coke oven or steel furnace, for making charcoal and clay firing? if not, that would be a neat concept.

[Maelstrom]

Useful Stuff has a pottery oven for firing clay items.  For charcoal?  You can build a charcoal pit out of stone based material and block the entrance with dirt.  I would love to see an iron door used to seal a charcoal pit, but nobody has implemented that, to my knowledge.