Nice review but I'd like to clarify a date.
Production did not start until early 1940 on these Ford or Chev CMP vehicles but several of both makes were made as prototypes or pre-production models in 1938/39. These did differ in looks from the production models and several do still exist. The very early Ford version of this Chev actually had Chev front and rear axles as Ford was not ready to produce the front axles in particular until later in the production run. These Chev axles were the heavy cast one piece caseing without the removable rear cover.
I have one of these Mirror Models here with the water tank version on it's way and I look forward to building these especially the Ford versions when Mirror releases them for sale.