Here's a project I'm thinking about doing: since the Wrangler Unlimited has basically the same wheelbase as the old Scrambler, take an Unlimited, stretch the bed behind the rear wheels about 11" to make it the same length as a Scrambler.
I think lengthening the bed can be done with some replacement CJ-8 rear quarter panels, lengthening the bed floor (not sure what with yet), lengthening frame rails, tailpipe and taillight wiring.
I would use an Alaskan Postal World Cab steel hardtop and rear swinging door (I happen to have one sitting in my garage). The hardtop roof over the doors would need to be shortened about 1-2" as necessary at the first roof joint to accommodate the higher rake angle of the TJ windshield. This shouldn't be too hard, since the top can be disassembled. I would add side windows to the hardtop like the Australian Overlander hardtop - the Alaskan Postal doesn't have side windows. Probably can get windows made to fit the stamped window opening in the inside steel panel of the hardtop from an RV supplier. Also, since the World Cab hardtop had doors with square upper corners rather than the TJ door's round corners, a small gusset would also have to be fabricated to fill the corner so the door would seal properly.
I've drawn a mock-up:
Of course, I have to wait until Jeep builds an Unlimited with a 5-speed - don't want no stinkin' automatic :-). Anyone heard any word on 5-speeds in the Unlimited?