I forgot to mention the electric power steering (EPS). City Racer has a kit Electric Power Steering for '73 and later Toyota Land Cruiser FJ40 - https://www.cityracerllc.com/products/electric-power-steering-for-toyota-land-cruiser-fj40?_pos=2&_sid=b558c4c56&_ss=r
This should be the easiest of...
Saginaw is probably the most invasive and fabrication heavy and best for BIG tires and hard rocky trails. Mini truck PS is the easiest, but is only good up to ~33's and milder wheeling. FJ60 PS is somewhere in between. How are you planning to use your rig?