I build that myself. It's not a product we sell. I work with a lot of different rifles, and a lot of customer stuff... so I use that kit for quick work when pressed for time.
However, my own personal rifles and rifles that I'm really dialing in... I never mess with the modified cases. I still use the comparator body kit to measure base to ogive though. You can make a tray that holds them really easily with a block of wood and vertical mill. (or even drill press)
If you want to skip all the modified case stuff... here's a vid for you: