One option for speeding-up the camp set-up and breakdown process, and to allow standing space in the van for changing and cooking would be to have a pop-up roof (see inspiration galleries). I found that these are easily available for VW vans, but not so for the Vito. That said, you could find something for around £1000 that could probably be adapted.
Then yet another internet search found a small German outfit building expedition vehicles with aluminimum, telescopic roof (click images to enlarge). Taking this as inspiration a version for the Vito using marine play with rubber seals was sketched out, and cutting out that back 4 (of 5) roof panels to create the opening. It would be a ‘no-going-back’ development so would require a lot of modelling and testing before build.