What did you have in mind for being in the crafting industry? I love the idea of having the building but outlining its purpose first is important.
In my mind at least you'd have to have a special chest or something with two or three 9x9 spaces in which you'd layout a crafting recipe. then, the crafting building could produce the item without actually using the resources. that's my basic thoughts on it. Unfortunately, this is pretty easily abused (Think diamond block). So you'd have to heavily regulate my idea which kinda takes away the fun.
I guess the alternative is that it does use up the materials (given same basic idea as above) but it can add special properties to the item. Like, free enchantments, or even other special abilities. This would be much more feasible and much harder to abuse. that said I can also see it being harder to implement.
Well those are my two ideas. What ideas did you have?