Hanno,
initially, I wanted to take the photo as the base for the drawing, but after comparing it to the other sources, showing
no sidewalk,
no door and
no sparewheel, I, too, concluded that it must have been a somewhat unique field modification (perhaps a kitchen).
So I decided to stay on the safe side and took the common type.
As Canada supplied over 1,500 mobile workshops (not necessarily all C60X), the bulk of the deliveries should have been series production types.
Here's another picture :
Regards, Oliver.