I'd add fuel injection to your list, you'll be glad you did.
Some kind of 'real' seat mounts for those seat's with the three point belts.
Why the body lift?
6" lift with basic trimming will clear the 37's.
4:56's or lower, depending on where you want the best performance.
Thinking at all about cross over steering set up or hydro assist?
How far do you want this truck to go in reality?
Back roads, woods roads, trekking kinda stuff?
Looking forward to watching this one morph.