Not a welder but imho a ‘fair’ welder 🧑🏭 isn’t gonna succeed. A ‘Master’ welder with careful and complete jigging combined with a good machine shop, ‘might’ make it happen. Not just fabbing and welding the grip portion but reweldijg the top assembly to the frame? For the time and effort you’ll spend, you could put those master-class skills to work and make enough to buy outright a couple of Korths.
If alignment isn’t PERFECT then the gun is gonna try to come apart every shot, accuracy will be nonexistent. You’ll warp the crap outta the lower portion that has all those delicate cuts. Once warped l, the side plate isn’t gonna fit right. Etc.
Sorry but if you thought you’d bought a fixer-upper that a few tacks would get you a cheap, functional gun…I don’t think so.
Truely not trying to be a downer here but other than just playing with it for giggles, I wouldn’t trust it. Use it for parts as intended.