The lugs made this process very forgiving as they hid any sloppy cuts I had, and held everything in place. It was then time to begin welding.
Those are long weld joints with a lot of material that is welded.
So poorly fitted, and covering it up with welding, grinding, and tapering the welds so almost all the added weld material is gone.
I believe the lugs are designed to have internal support from the brazing/soldering material. So, in this case, almost all the lug support is at the tips of the deeply ground welds.
I don't know, I might ride it, watching it carefully, but I'd certainly be concerned about the joints, and would inspect it regularly.