Bob,
Here are documents which detail the original production forecast from 08 Feb 40, and the initial shipping plan from 15 Feb 40. I haven’t found any documents which detail if there were changes to the initial plan.(images from microfilm C-5142, images 444 and 486
https://heritage.canadiana.ca/view/o...reel_c5142/444
The 27 May date mentioned above, was after the “First flight” SKD shipments had arrived in the UK, and after the subsequent CKD shipments started arriving in the UK, and they experienced increased challenges with the assembly ( and missing parts) of the CKD shipments, and the staff in the UK requested a reversion to SKD packaging.
I haven’t found any documents which detail the start of F15A/C15A production.
Regarding Ford serial numbers: initially Ford CMPs did not have ID plates, and they only used the engine number to identify the vehicle. Later production received serial numbers and ID plates.
Regarding Chev serial numbers: Attached are images from the C15, and C30 parts lists. With the noted serial numbers for new parts being the same between vehicle types, I am inclined to think that the 5 digit serial number was cumulative throughout the year regardless of vehicle type (preceding 5 digits being year and model number). (Interesting side note: the serial numbers seem to indicate production of 11 cab, then 12 cab in 1940, a reversion to 11 cab at the beginning of 1941, then the complete switch to 12 cab after vehicle 5003 in 1941. This might only indicate some pilot model 12 cabs in late 1940)