I’m making my own from the tin man diagrams. I bought the 2” steel square tubing from my rebuttable steel and fab shop. I didn’t even worry about some Dom whatever steel. I have never had a problem with any, well I guess soft steel? Jeez really? I guess if I were racing or jumping ramps, then I guess. But we’re just talking about some frame connectors.
I built overhead cranes and floor conveyers for the automotive industry, well of course that was different. Was a long time ago and I really don’t remember what exact steel was used, I just did the fab, the paint and some install too. I highly doubt it was much other than just a good quality cold rolled flat and square tubing. Again, it’s been 30 years since I was doing that.
