In my experience in Poland you leave the stuff that has to fit in the countertop at the stonemason's workshop and they measure/test fit everything there. My guy

In my experience in Poland you leave the stuff that has to fit in the countertop at the stonemason's workshop and they measure/test fit everything there. My guy has a bunch of (perhaps?) old machines that all do the cuts flooded with something that resembles diamond tooling or grinding wheels.