Wouldn't it be neat if we could create a scrapper building.
The building would specialize in recycling old unused armor/weapons/mech extras and/or primary weapons/jewelry and turning them into the essential wood, stone, copper, bronze, steel and cobalt. Depending on the item, you could also receive weapons grade steel. Items returned from the process would vary from item to item.
Perhaps special items that cannot be created, ex: unchecked growth could have a small percentage of having a precious stone returned or even 1 soul.
Small building would return 7% of materials used.
Medium building would return 15% of materials used.
Large building would return 30% of materials used.