Hanno,
I am surprised you have not seen many photos of the early type of body fitted to many CMPs with No 12 Cabs, which had lower sides than the one seen on later CMPs.
This type of low sided body was made in Canada and this photo came from one of the threads on this site. Although it is fitted to a No 13 Cab vehicle in the attached photos, it was very common as far as I can tell on the No 12 Cab CMPs seen in North Africa, Sicily & Italy. Presumably the body type continued for a few more months once the Canadian factories had switched to No 13 Cab CMPs.