Hey Felgrim,
I like your suggestion and I'll consider them as well.
Wood is for smelting and later on, cheap weapon parts. Coal will be possible as an upgrade to wood for longer furnace time.
OH! Maybe something where once you hit a certain threshold of money they begin requesting certain materials. Like once you have 500 in your chest, regardless of what you spend it on, they start asking for tin sometimes. The more you create tin weapons the more they ask for it and so on. Also I think it would be cool if they asked for specific handles and grips in addition to materials, just to keep us on our toes.
Maybe something like a reputation rating for the shop based on how accurately, quickly, and how often you completed requests. Or maybe a system where when the day starts, or week, or month, you recieve commisions based on your reputation. Like 300 swords by the end of the month for his majestys royal army! Then you would have to decide to keep the shop open or focus solely on the comission. Of course small comissions could also happen, like a tin greatsword with a fancy handle by 6 pm.(IDK if there is going to be a clock eventually).
What if once your rep gets high enough you could begin outfitting the army and sometimes wars could start up and based on how well you outfit them the tide of the war updates daily. Then it wouldn't be a game about crafting to make money(because you'd be funded by the king) but instead a battle of how fast you can make weapons.
I have no idea where you're going with this game but I'm gonna enjoy it no matter what lol. Once I get some money I'm going to support you,