Finished the back brake conversion. It has its challenges and I'm still not convinced its correct. What little pictures I can find online, the brakes are in the back of the disc, but the caliper bolts hit the leaf springs and prevent it from coming together. I was able to get everything installed, but had to assemble the caliper on the bracket then slide the bracket in place and bolt in. Everything works, and I'll probably never have to deal with it again, at this point not sure I'll even drive it enough to ever wear out the pads.
I took it for a drive down the street (standard no windows, doors swinging open on their own, no tailgate, bed full of parts drive). Brakes work great and the electric power steering is amazing. Feels like a new car, so easy to turn the 33" tires and solid, no play in the wheel. Love that modification.