Chinook RV

Okay, well, it's rectangular, as described. I don't think the shape changed much in the "modern" era (say, 1997-2005), as the basic size of the refrigerator and generator used didn't change to my knowledge. So it's the basic rectangle shape I described above. Essentially, the door is most of the space with "face frame" type pieces of the MDF that makes up the rest of the cabinet carcases, plus the typical 3/4" x 3/4" cleat/corner stock (on the inside).

Or is there something else about the shape you are asking about?