I would say it's TIG, I was about to ask something similar. To weld those external corners with MIG is very tricky, but in my experience internal corners with TIG are tricky too, I was wondering if Jim is planing the welding around the external corners.
Jim, do you use TIG for the internal corners, the temporary jig welds look like MIG, although it's hard to tell at the distance.
It's fascinating project, I tend to cut the metal with a thin, 1mm x 125mm grinder, I find it pretty accurate and fast. The only difficulty is narrow slot ends but I usually manage one way or another. Looking very good, well done.
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