As far as Bumpers, sliders and belly plate as I understand it, are all custom made. 1/4" steel (note: front bumper with Air tanks ea. side), all except BP welded to frame (pros and cons).
Yes, a Rear swing out with new TMR spindle that gives it a little bit of a squat there, also due to added wt from the Inside drawers same side.
What you are having done is pretty much all I and
@PhatFJ did last Spring. Both rear Quarter panels and around doors just the same, new Driver front quarter panel I had bought 3 years ago replaced. Then Painted Original White inside a Vevor Blow up booth by the Phat one.
So I can easily Id with all you are getting done. Is it perfect, no, but I am stiill very pleased with the turn out. New (AM) Gutter trim, Bezels, Griil, Weather seals around Doors and Windows (don't remember all the Techn. terms) Tail lights, Emblems except the Blue 4WD one. Made some flaps for inside the Rear vent and more I can not think of at the moment.