I do all plating inside the frame wells. As you can really coat the inside of the frame.
Did you keep the pipe in the back intact?
If so slide a pipe in it and weld it into place.
That frame is going to flex quite a bit with all those crossmembers missing.
I would super stiffin it up by running that 1/8 plate on both rails inner and outer] Maybe slight overkill. I know that will reduce the frame flexing as you removed several crossmembers.
Plus if you are pulling on winches from front and back. The extra steel isn't going to hurt especially off roading when you can snap things off the frame. The inner steel gives you more material to weld too.
I did both rails in my 5 speed as I an putting hitches in both front and rear.
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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread:
https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer:
https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information:
https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html