Galley forward with a convertible dinette in the center or the galley in the middle with a full bed in the back are some floor plan ideas for converting a van to a camper. The specific conversion options may vary depending on the size and van model being used.
The galley forward design allows the convertible dinette to be used as two twin beds of flattened out to make one large sleeping quarter. With the table removed it allows for passage to the rear of the van where a closet and porta potty can be incorporated into the design.
Placing a full size bed across the back end allows one of the center sides to be used as a galley while the other can be equipped with a closet and porta potty. This design allows a full walk-through layout where the front seats spin around and a removable table between them forms a dinette.