Picture 2 in post 16.
Looks like the harness bar wasn't notched where it meets the main hoop and the gap was filled with weld. A few other welds look similar and maybe weld bead was used to hide poor fitment.
Before you do any more work, call the local SCCA region and find a shop that does annual tech inspections. Take the chassis there and ask them to inspect the cage and get their opinion.
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