My G1 setup.
Rear, Nascar type alloy brake hats machined & drilled to fit the axle flange. Select rotors to suit. 11.75 to stupid large OD and a variety of thicknesses. The rear Calipers I used, I actually do not recall, they are kind of obscure as in Maserati Quatraport of something. They were a respectably long pad with P brake off the back. I never did set the P brake up.
Today there is such a good selection of Brembo or Willwood style calipers I would look at.
Front, I think it was 1" thick aluminum bar stock that I machined to mount the stock car type disk.
Toyota 4 piston caliper.
Way back then it took me some time to find good pads but once I did these brakes served well at both high speed and low, mountains or mud and hood deep water crossings.
The interesting part of that Montero, I spent a bunch of time pocketing ball joints, shock mounts etc. 8 ½" front travel was the reward.
Photos I hard to get right now, it is parked in window deep grass and the underside is a Northeastern crust. I know I have some though both on film, which I shot slide back then so the thousands of slides are hard to view. I do recall shooting some digital a decade or so when I was still driving it.
I do have a few pics of the 35 gallon alloy fuel tank that I built with 5/16 plate. I just jack in the center of the tank to lift the rig.