I think it would be sweet! Just remember in addition to the sheet metal work you have to worry about frame flex cracking that body if the body mounts aren't just right. You would also have to design and build a completely custom interior. It might be worth shortening the frame length some to make it a little easier.
If you have the time, money, and knowledge then build it and document the build for the rest of us to enjoy and cheer you on.
I would probably reinforce the frame with plate steel and crossmembers. The custom interior was a given.
You could also go really over the top and build it with the tandem rears in place and just super single the tires. That would make it the Baddest SUV ever!!
Good luck!
I thought about the tandem super singles, but the more I thought about it, the more I liked the single rear axle. Screw the soccer moms in their Escalades with their Starbucks, I want a REAL SUV! This thing would make an awesome grocery getter don't you think?
Looks like a HUMVEE on steroids.
One issue is how high off the ground the rear is if you are loading people or cargo into it.
A cut down stock deuce bed with a fiberglass shell on top would be pretty neat.
I would make it higher in the rear and sloping down to where the front doors end kind of like the old aerodyne cab over trucks.
I would want the body to be continuous and relatively seam free just like any commercially available SUV out there, but the fiberglass shell would be cool for an easier build. I also want the Full body, so there isn't a bulkhead separating the passenger area from the cargo.
I was thinking the H1 Wagon style rear doors for ingress/egress, and as far as the height issue, I drew out an idea for a fold out step that would simplify loading/unloading of people and cargo.