[120mm]

I'm relatively new to the forum, and notice this section doesn't get much play.

I used to be an A&P mechanic and have welded up a few aircraft tube steel frames out of 4130 chromoly using Oxy-Acetylene out of a micro-torch. I'm wondering if anyone out there is scratch building Cobra frames using this or everyone is just using TIG/MIG.

I'm also looking for reliable drawings for the Cobra frame, or a modern adaptation that would work.