Just for the record, I made a V2 ball diff using a drill press, dremal and a (very small) file, made the pins from cut down wheel pins.
Took about an hour of work to get it perfect, worked fine.
I could have made a jig to drill them in about five minutes if I was still running the truck.

Anybody can build anything if you set your mind to it and take your time, and have the patience.

I'm sure the real V2 would have had better testing and would work better, cost aside.

Even for outdoor loose stuff I ended up going back to the VTS, it seems smoother and put less stress on the top shaft As they tend to bend the threads thru all the pressure of a ball diff.

Just my 2 cents worth.