As best I can remember: the
oil cooler opening below the radiator opening was added during the european campaign ('64 season). I'm not sure who actually did the modification - if it was Remington it was probably as good a job as could be done anywhere. From what I read, the body was cut and stretched to make a "scoop" - - so the "FIA body shape" could be, imo, with or without scoop.
IMO, no two cars had the exact same rear flares. Probably each car was different in otherways from race to race.
"How accurate is the Kirkham FIA body shape to the orignal FIA cars?" Which race, which season?
IMO, this is a moving target - choose a look you like and go with that.
Disclaimer: this is my opinion and only my opinion blahblahyaddayadda . . .