Thanks for all the suggestions. That Miyata 1200 is just my size, and basically right down the street. Our instructor said Metals Supermarket in Niles, IL (and several dozen other locations across the USofA) is a reputable place. Also, I'm hosting a
vintage bike swap Saturday. Maybe someone will bring something I can justify cutting up. (And there's a sandblasting cabinet in the shop to boot, so I can get rid of any paint before heating things up.)