Hi Ed
Interesting that the author states that a lack of access to Shermans created the Ram.
It is my understanding that the Ram was set by design in "early 1941", a prototype out in June 1941 and production (Mk I) commencing in November 1941.
The initial design requirements and construction of the Ram prototype led the US, in April 1941, to adopt the design into their T6 model. First prototype in September 1941 and production (M4 Sherman) commencing in February 1942.
Am I wrong?
regards
Darrell