In regards to the armour used..I do know a couple of the answers.
The Stug is based on the chassis of a British A.P.C. (sorry forget which one)
The Tiger a T34
The American Halftrack is the real thing
The German Halftrack is a post-war production from an Eastern European country (also forget which country....bad memory)
The Shermans are Canadian M4A1 Grizzleys (note the tracks...Canadian Dry Pin)
The Cromwell is the real thing (I think)
Sorry ...I'm unsure of the Jagdpanther (again possibly T34 chassis)
They did some good research on these vehicles to give them the right look.
Happy Modelling and God Bless
Robert