The character is a man who's been homeless for a number of years because of a workplace accident and alcoholism. He needs to tell interesting stories to my MC and I'd like it if it involved a really interesting hobby to illustrate that, despite being one of the nameless homeless, he once had an interesting life, a home, a family, a job. If the hobby were ironic it would be best, I think. Your idea of making swords or knives might work well if I have him later suffer a stabbing. I need to hurt him, so that might be good. Or if the hobby simply involved a home to some degree, that would be ironic too, I think.
Thanks for all the ideas so far!