I dunno; I think any competent smith understands enough about the real world not to work in a place where the weight of his anvil, tools, and metal stock will be doing their best to follow the law of gravity. And the constant jarring from hammer-blows would just make it worse.On the other hand, the guy COULD be either a total nutcase or WANTING to look crazy for some reason, after making sure the whole place is actually held up with hidden mithril spars; you never know.