I made my stand out of 2x2 steel 3/16" thick so I could drill and tap into it and have enough material to give me enough threads.
Wow! That's gotta be one seriously heavy duty stand!
I welded my stand using 1.5" square 14 ga mild steel, a little more than 1/16" thick. Threading pretty much anything into the stand itself wasn't part of the plan, so where I needed to attach "stuff" I welded in 1/8" thick hard points, which I could
For my simple 1/2" iron gas manifold, I welded in two hard point struts, to which I screwed down pipe hangers...