How about a Stronghold-esque supply dump that is linked to autofil and auto-take from production buildings (provided it has sufficient raw resources present).
Filling smelters, crucibles, food troughs etc is no fun and is heavily botted so why not just remove the requirement ?
The supply dump itself could function as a container with a building size footprint and generic image of piles of stuff, with resources deposited,displayed and drawn out similar to a granary. I fancy much of the required code for interacting with the production buildings would be copy and paste from barter stands.