I remember your iStar build thread Glen and I agree these are nice lenses and make a fun project. My own experience was with the 5" f12 R30 lens and a couple of 5" f5.5 lenses. I also made a couple of Scopes with D&G lenses.
Telescope Express also has some lenses available for ATM builds.
https://www.teleskop-express.de/en/t...-1000-mm-14406
https://www.teleskop-express.de/en/t...-1800-mm-14413
https://www.teleskop-express.de/en/t...-in-cell-10290