Welcome, David!
Unfortunately, we don't have a large number of faceters on this board, but there are a few. Natural rough is extremely hard to find nowadays, as you know, and it's also extremely expensive. My suggestion to you is to join the US Faceting Guild at
https://usfacetersguild.org/ and ask on their discussion boards. They just launched their brand spanking new website (which is really nice) and for $18/yr. you have access to all of their resources, including all their newsletters going back to their inception.
They also have a Yahoo group, which you can also join for free. You may get a better response there to start, as that list has been going for years now and the website just was rolled out a week or two ago.
Another good place to ask would be the forums at Gemology Online (
www.gemologyonline.com). Lots of faceters there that will hopefully be able to help.
Good luck!