I have a spare subframe I pulled from my old 68 years ago. It does not have any rust issues. I sandblasted it, had the seams welded and the upper control arm mount removed, modified and reinstalled, aka Guldstrad-Mod. The frame sits in DuPont epoxy primer right now. Unfortunately, I am in the Memphis, TN area. I plan to put it up for sale here very soon, so I thought I would throw it out there. Like you said, though, shipping would be a buzz kill