Tunnel ram or no tunnel ram...

Not a machinist. I taught myself how to do things on equipment that's available to me sporadically. It just takes me a long time to do something a machinist can do in a fraction of time. Originally I took one piston and clamped it in the lathe with a sleeve around the skirt (verified run-out) and then I cut the dome off to help conceptualize some aspects of a theoretical build. There I learned they could be repurposed to what they are now and had Rebco do the rest because I couldn't beat their price, timing and quality. After, Line2line did coat the skirts.