There are times when you shouldn't talk bad about others. I have many cases I would sell very cheap to someone in need. Many times people cut off their nose to spite their face on this site. What style case do you need? That would be the first thing someone would have to know. I brought several home recently that are parts only due to sitting at the farm for so long and ring gears are rusty. Sure grip? Cone Style? clutch style?
My son also repairs anything . But it in reality would be cheaper to find a case. Welding it would weaken it unless a process is followed $$$. Plus more than likely other parts will be needed.