Took the first step towards building my shop

[metric_taper]

Well I have the floor joists welded in place for the buss entryway landing will weld in some girts between them to support the eventual floor surface.
Now probably it may seem a bit extreme to use 4x4 sq tubing for the joists but that was the materials on hand.

I'm surprised to see that 'dog leg' in the left side support beam. I assume it's because you had 3 longer pieces of square tubing, and why waste a few feet cutting them the same. Good thing you don't have inspectors around, as I believe they never let a beam have a welded joint. Not that I don't believe you have excess structural integrity, both in the strength of materials, and quality welds.
I have I-beams I've spliced, but only when no one is looking. But I know I have full depth weld penetration, and a limited 2nd floor load.
Nice progress.