CNC and pre-polished stock would make it a bit easier! That coat of arms is really, really good. I love you stuff and I wanted to share I used to do cutting, polishing, finishing and installation back in the 1980s.
I ground the surface of these stones at the Ukrainian Catholic Cemetery in Campbell Hall, NJ. There are some black onyx stones here too that are just outrageous. (Our stone came in on depressed flatbed tractor trailers in 20 Ton Blocks)
https://images.findagrave.com/photos/2007/101/CEM46884184_117636029684.jpgThe man I worked for Ted Fournier, his wife would prepare the stencils with the letters and rosettes, he would affix the rubber to the stone, cut the letters and roses out, and blow them out with mica like you. He taught me how do it, so I know what can go wrong! I appreciate you showing what you do from time to time! You do good stuff man! *!greengrin!
Do you guys use chisels and oxy-acetylene torches to 'rough up" the cut face on the stone still?