The Ceratac is NOT a DPMS platform. It's a AR10A/SR762/SR25 platform. I'm the one the built the rifle in that thread, any questions, just ask.
I can also direct you to a place to get info on the same rifle, without using the 5d tactical jig, and Ceratac adapter if you plan on using a regular end mill.
Edit: saw you were using 5d tactical, is it the pro jig? You need the Ceratac jig adapter, it's made by 5d tactical for this rifle.
The barrel nut required a 1 3/8" wrench. You'd probably want an sr25 lower vise block and most likely an upper vise block for Ar10. Plastixrevolution.net has and upper vise block that fits AR 15/10, and a lower vise block, both fit the Ceratac upper and lower. Beyond that, your AR 15 tools will work. I also used a couple extra barrel nut shims to time barrel nut to hand guard (these are larger diameter than AR 15 shims). YMMV