The ironic thing is...
...if the original "repairer" had even a cheap welder and even a rudimentary knowledge of how to use it, it would have cheaper and easier to tack in new metal the first time instead of mudding it as if he were hanging drywall.
I made my first patch panel about 20 years ago and had no knowledge of it at all. I watched a video of it and went out and gave it a shot.
We learn by doing.