I added some pictures to album. It shows that the arm is not solid but rather folded over.
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Is this the stock that you reworked from the original NHM-91 Thumbhole stock? Looks good! I can see what you were concerned about for reinforcement pins. You could probably fit your own pins or just use it for display and looking good!
Yes it is, it would probably be alright but I had a spare RPK stock so I fitted it on. I was pleased how it turned out. Sort of redeems it from the thumbhole stock it was.
Not hard, just sand a bit and fit, sand a bit and fit. Eventually it goes on.
Here are my Russian and Serb cousins.