I've recently had the luck of picking up a free frame-- a vintage lotus.
but the downside is that there is a pretty big fracture on the downtube, going almost all the way around the tube. I've thought about doing something like a fillet braze across the gap, but I'm afraid it might prove to be the weak point in the frame. Tig welding seems like the safer choice, but I don;t have access to that kind of equipment.
here's a pic of the gash. The previous owner sawed off the brazon shifter bosses and went a little too deep.
Mind you, I've never done any type of brazing before, so any input is welcomed