Gemcad?!? I don’t even have a computer!
It’s making a little more sense to me now, I think the idea of switching P5 (main facets) to go before the P4 break facets is to ensure even lengths on the girdle segments. Kinda scary to start laying in the main without knowing when to stop, as the break facets P4 and the girdle facets g6 cut away a lot of girdle to bring the bottom of the P5 main to the girdle of the stone. I’m just more accustomed to cutting the main to stop at an existing girdle, but in this case, the girdle is cut in after, to end at the bottom of the main. It works either way.
I just finished polishing the pavilion, and transferring now. Will cut the crown in the morning.