Hi Badi,
I have been trying to answer my own question about the cooling ducts on the rear cowling. Salos car in two of the reference photos you provided has the cooling ducts open. However, it could be Brazil or Argentina in those shots, I just don't know. The title of the images says
ersteLackierung which translates from German to English as
first lacquer finish (well according to Systran on my Mac it does). And, well, to be honest, that makes no sense. Can anyone here who speaks better German than I confirm if it also means something like Salo's first GP finish?
The images appear to be from the same race, and it appears to be wet. However, it says that Brazil was a dry race. However, the horizontal bottom surface to the top of the hoop appears to be evident on these photos, indicating that they are Brazil, because according to F1 Facts photos, that part is arched for the Argentine GP. Compare these images:
Bottom line: I guess that the cowling will be open for both Brazil and Argentina. Presentation cars tend to have no cooling requirements
so they cover up all the holes to make it look pretty. Unless I find evidence to the contrary, I'm going to model this car with the cooling ducts.
Kind regards,
Bill