Got a response from ronin's grips already he has been considering this already, here is the email:
"I am considering it Edward. If you know of folks who are interested, please have them drop me a note.
Which RPK are you talking about specifically? I am considering a Romy wood based set to cover a broad section of rifles. I also have a Russian Vepr IV RPK that I plan to confirm the Romy set will fit on but haven't done so yet. I am not planning to support the Yugo M72 RPK at this point.
If I go with wood, I can have nice thick and strong furniture. The thin walled ribbed stuff is very problematic for me to cast reliably so I don't plan on going that route.
If everything comes together, this would be a project for either this fall or next spring so I am actively thinking about it.
Any thoughts on my using a Romy set to make the molds?
These are the questions he asked me, hopefully we get some response. I have a Romy AES-10B a and want a poly club foot and hand guards that are the same dimensions as a wood set.