There was a truck here in Portland last year that had that same set up. They were retired from Wales, had moved to Australia and bought a Disco 6x6 to live out of for a year. Then they moved back to UK in order to build up a Defender with this camper set up. Shipped it to North America, and they had been driving around the US and Canada for a year.
It is a very nice set up; although, I certainly would not do it with a four door. I'm planning on using elements of this type of thing when I build up my own 110.... after I get the Tdi in.... after I sell the Audi....
I love the usage of the room in the rear wheel wells for water storage.