Customer of had work done elsewhere, came to us for the alignment; appalling repair on a subframe

They rebuilt the front suspension with a side of steering knuckles. These control arm bolts have a bad habit of seizing, and when they do, they need to be cut out. I prefer the OA torch, but this chucklenut mangled the subframe to get a wrench on the bolt, then slapped some popcorn and paint on it.

I'm not a welder by trade, I'm a mechanic's apprentice... but come on, even my bad exhaust welds look better than this. I declined to do the alignment, pending proper repair or replacement of the subframe.

Now I do have a question: with what we have (MIG, 0.030" mild steel wire, 100% argon), is this a repair we could have done, and be confident about? This is outside of my skillset for the moment, and I'd kick this over to someone better, but can it be done?