Numrich has good kits if you plan to reweld later, but bowman has good kits with barrel included.

As far as frames go, ATRH, my remix and there is an AR trigger version I can’t remember who makes it though.

Not really a handgun but skorpion vz61 parts kits are cheap and plentiful and they are super easy builds. One of my favorite guns to this day.

I really think it will work.

Honestly I’d just buy one now, cuts on my kit from bowman were really good so it would be an easy re weld either way better to have the kit now.