When my Hiace was going I would just put a bed in it when I went away. I have already given the walls a several thin coats of white household enamel which looks ok. I was thinking of replacing the roof lining that is torn in several places with kitchen carpet (it is washable with short bristles) and lino on the the floor. I have caravan sink I can put in. My main question is I can store some stuff underneath the bed but what about the wasted space above? How much clearance between the mattress and upper storage space?