Here's what I got, allow players to convert some of the resources into more refined versions or degrade them into lower quality. A player can do this either through the Exchange Lady on Silver-Eye (You bring the material you wish to convert and some silver) or ask a craftsman to do so. (Armoursmiths further refines the Simple Metal into a Sturdy one)
For craftsmen the refining/degrading should be tied to a certain level of the skills, 30 maybe?
For the moment this is alll the example I could think of, but I'm sure you guys manage to come up with a few more:
3 Rugged Timber -> 1 Hardwood
1 Fine Timber -> 4 Hardwood
4 Simple Metal -> 1 Sturdy Metal
1 Sturdy Metal -> 3 Simple Metal
Update: Make the process of refining/degrading to require the use of a Smelter or a Sawmill object (like the same way an armorsmith needs to use an anvil)
That's all.
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