As to the question of taillight height
Ideally they would stay at stock height, already relatively high compared with most vehicles. They look kinda funny way up high like that. But leaving the top and nixing the bottom will simplify things a lot.
Even so, getting it all closed up back there will be a trick.
The door.... oy.
The original 1983 door was only 35 inches wide.
The rear crown and wall from 2000 has a door 38 inches across. Why they changed it, I can't guess. Everything else was identical.
Currently the top and bottom door sections swing separately and the top is dangling crooked from one hinge, just based on where the cut lines fell. The bottom hinge was below the line and was rusted to death.
I've been considering 3 options,
1, leave them separate and properly hinge the top door
2. (Most likely) Weld them together and hinge it at the bottom as a ramp door. I assume I could even multi-purpose the winch that lives above the door to raise and lower it.
It could also be used as an odd little deck, and likely a means of accessing the roof.
May have to remove the windows but will try to install hinged plywood flaps to protect the glass when open
3. Cut out the whole mess and install a steel doorframe and a real door.
Could simplify matters or become a barrel of worms. Dunno. And I would lose the ramp/deck/drawbridge door.