Re: Frame material questions
Mild steel is okay, not quite as stiff as cro-mo.
Also, the DOM I have seen is not the same wall thicknesses (not as thin-wall) as the cro-mo usually is.
For just one frame, it wouldn't be much to mail-order the tubing from somewhere online. You'd only need 3 or 4 pieces a couple feet long, at the most... That way you could first cut a donor frame up, and then order the cro-mo tubing that most-closely matches the frame's own tubes.