I just read you complete thread, what a journey.After careful consideration, I think the next big step is going to be an aqualu extended tub. With the wheelbase stretch and comp cut, I'm not liking the current look of the truck, plus the proportions just don't work for me.
I've seen a couple of other people have aqualu pre-cut the rear arches to accommodate larger tires. and I think it really helps the truck look "right."
I would love to build another J4 bodied rig some day soon.
As far a stretching the body out, have you thought about just getting another rear section of a 40 & welding it in rather than spending a couple thousand on a j43 aquqlu tub?