[katkatman]

Most of war series/movies hadn't original materials, like with the Battle of britain movie, He 111s and Bf 109s were powered by Rolls-Royce Merlin (This planes were bought to the german by Franco's Spain, but they were unpowered when they have been delivered), U can also see 1941+ planes version when the movie takes place in 1940.

Personally, I prefer this kind of things instead to see virtual planes moving like Bots with impossible camera angles.