Rob,
Another potential source of info is some of the early NDHQ files.
Library and Archives Canada has this entry:
Secret and Confidential Subject Files, Army - Design and production of Department of National Defence mechanical vehicles for Canadian Active Service Force - 15 CWT bodies.
Date:
1940-1941
Reference:
RG24-C-1. File number: 8186-11. Microfilm reel number: C-8357.
The above file should be found somewhere within the 5664 pages of this microfilm (it appears that most of the files on this microfilm deal with early CMP production):
https://heritage.canadiana.ca/view/o...8357/3?r=0&s=1
Colin
Edit: The 15 cwt Body File starts at image 4213