I actually REALLY like your idea.
In some ways it looks alot like a 1st Gen 4Runner (Something every Jeep would be good to emulate

) with the added rear overhang.
And I really like the one with the added Roof Height.
This one
REALLY looks like a 73 series Cruiser. Granted it's not going to be the hot ticket for a CRAWLER but... I agree too though that the rear doors do add some utility BUT I my rig (a 1st Gen 4Runner) is PERFECT for 2 people. plus with a body like that you could sleep pretty comfortably in the Jeep.
That said, I think a J8 would be superior and probably cheaper then all teh custom fab-work you'd have to do to get what you're after. I can honestly say that in all my years of 4wheeling I've never found the slight added length and wheel-base of Toyotas to be a
disadvantage Yeah the breakover angle isn't as good, and they're slightly harder to turn around on a two-track, but in every other situation the longer WB of toyotas is an asset. I've walked up climbs with two open diffs that a CJ7 with dual lockers and bigger tires had issues with just because the WB helped me take it slower and more in control.
OR, better yet just buy a 4Runner and be done with it. If you're not into rockcrawling I'd say that a 4Runner can already be had with what you're after AND willl be more comfortable and more reliable. That's my opinion of cousre, but I've had ALOT of Jeeps and I am now a Die-hard Toyota Guy so...
Either way, like I said, I like what you're thinking. I too find the 4Door Wrangler to just...well... not LOOK right. They are however supremely capable trucks that just need a better motor (or the old one they used to have

)
Cheers
Dave