Here's a good example of a bed running lengthwise beside storage cupboards in a Sprinter van conversion. The owners have bench surfaces on both sides (with the sink on the door side) and still managed to accommodate bench seats with a slide-out table/desk. Great use of a 170" wheelbase Sprinter.
Underbed storage plus 12" deep, tip-up overhead cabinets with hydraulic hinges, and kitchen unit storage (19" deep). All cabinets built with 5/8 or 3/4 inch plywood. We liked the raw look of the plywood so we did 3 coats of clear polyurethane.
We built a sliding drawer on casters with a large hole cut in the bottom for ventilation. On the right hand side of the cabinet we also have a vent placed exactly where the fridge motor is for additional ventilation.