I registered to post this! Often had a nose around but never felt the need to comment.
Anyway, we have a T5 Kombi (rear seats that can be removed) and we did a basic conversion which suits us. It's by no means a camper but we can store the bikes inside and sleep in there (more a tent on wheels – think electric cool box and camping stove rather than built in units). Unfortunately no pictures to hand, I'll see what I've got later.
Attempt at a description:
We have made use of the fact the rear seat folds flat and built a platform behind at the same level using scaffold poles and carpeted ply. The scafold poles mean no central support is required. This leaves sufficient room to slide 2 bikes under (stacked), with front wheels removed (easiest if pedals are removed too), plus several boxes and bags.
Great thing is the platform is easily removed and we can then use it as a 5 seater, a van, etc. It's our only car so needs to be versatile.
One thing I would do differently next time – put some karrimat under the carpet on the ply bed – ply is very unforgiving.
Steve