If I were in the mood to build up a(nother) simple yet capable 80 series for expedition, it'd be more about what I take out than what I add. After conducting typical maintenance, I'd start unbolting stuff left and right...
Stuff to remove:
Take out 2nd and 3rd row seats, place in garage or closet...unless you need the passenger space. This will allow plenty of space for camping gear and, if need be, the occasional night slept in the back of the Cruiser.
Remove side-steps, mud flaps, and flares...they are unnecessary, and only hang up on obstacles.
Do the insanely easy, insanely cheap spare tire tuck mod to get that spare tucked up nice, in lieu of a rear "tyre jockey", which usually come from Australia, and come with a price.
Stuff to add:
Off-road tires (in a popular A/T or M/T, depending on your preference) in 285/75/16. That's 33" of meat, no lift required, which should provide plenty of traction, a little added clearance, and be common enough to replace anywhere at anytime.
Recovery gear. Strap, shovel, etc. Extra fluids, some basic tools, jump starter, tire kit, air compressor, etc.
Camping gear. Sleep gear, kitchen, cooler full of food and beer, clothes, etc.
Bins to put it all in, and good straps to strap them all down.
Replace broken and/or tired components with better ones as the need arises.
Gas. 87 octane.
Stuff not to add:
Roof rack, roof top tent, off-road lighting, loads of armor, off-road trailer, refrigerator, laptop mount, dual battery system, giant lift, giant tires, drawer systems, or any of the other power-sapping, heavy, overly complex, stupidly expensive mods that, for all intents and purposes, take away from the experience. Buy as little as possible. Stay as far below GVWR as you possibly can while still remaining fairly comfortable, and you'll be fine.
Your simple build won't win any hearts at the Caviar and Canvas Overbuilt Overlander's club meeting, but less gear means you'll have less complications, and more time for other, more important things, like kickin' back, drinkin' beer and talkin' story over a camp fire.
And more money to buy better beer.