I think that with a high skill level and lots of time, you should actually be able to try to make anything (simple wooden shield etc. , attach metal with BS, this could make "crafted" or "crude" (maybe masterwork at high levels) items, not just sticks transforming to general items). But only with a high skill level and time (not like 30 turns, more like hundreds) and of course harsh chances of failure, maybe even critical failures with low skill levels (cut yourself with a hatchet).