I have started on my RPD build with the kit from AK Parts, I lucked into a 100% receiver, but it is the external cocking handle type. I have a new handle coming and hope it is the right type, if not I will have to make one.
So far I have the installed and headspaced, bolt & carier and lower modified and am working on the internals. I have the striker setup made, but have decided to try and make it hammer fired. these are really nice guns, I may get another kit and shorten the bbl to 16" and make a spade grip setup for it instead of the stock.
if there is enough interest for a 100% receiver / build kit they may become available soon.