
I was wondering if you had access to a punch press.
1/8" or 10 ga.?

Sectioned die or angle and welded? (I'm guessing sectioned die - well, actually punch, but you know what I'm talking about

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Methinks you'll fit right in! There's a few others here that know what we're talking about.
It feels stable now, but for the long term it'll stay stable for a longer period of time if you cross brace between the uprights unless you've sunk them down over 1/3rd the total length. If you cross brace, tie where they cross each other together. You'd be amazed at how much stiffer that one fastner makes things. But, it's in a lot of shear.