Re: campervan conversion
Basically, what I did was buy a rock and roll bed (they are designed for the Bongo, but fit the Granvia) Then I built the rest around it.
The bed goes on the left hand side and cupboards along the right. Full height until they meet the moon roof and then half height up to the driver's seat. The fridge goes behind the driver's seat with the gas rings above it, then the sink and cupboard under, behind that.
The fridge needs to be at the front so you can open the door when the bed is down.
Access to the gas and water is through the back when the tailgate is open.