Brun posted these in the 1939 thread, but they fit in here too. These are the minutes of the Merano meeting previously mentioned in posts by Hans, Tony and myself. The intention appears to have been to set up an Axis alternative to the AIACR. Mercedes and Auto Union were represented, as were Alfa Romeo. But not Maserati.
There are confirmations too - note that this says the Coppa Ciano and Coppa Acerbo were definitely to be for Formula cars, unlike one or two of the press reports.
The Italian GP OTOH was to be for Voiturettes, but from my rusty German and looking at the subsequent press reports it looks to me like Huhnlein must have been "persuading" them to switch it to Formula cars as he didn't consider it to be a Grand Prix, so they compromised and agreed to hold the GP for Formula cars and a Milan GP for the Voiturettes: that of course raises the fascinating prospect of a double assault by Mercedes Benz! And by AU? Seems not, if Dr Bruhn's annotations are to be believed. :
Interesting that the German GP was planned for October, not its usual August date. That's the first date I've seen for it, but I'd assumed August as normal.
And a nice bit of attempted disinformation from Alfa Romeo here: they are claiming that they wouldn't have a car available for Formula races, which is why they wanted 1500cc racing again. They must have figured that the 158s now had the measure of the W165s, and if not there was the 512, which the final paragraph mentions as "private information". But that also reveals that AU knew about the 162 too!
Fascinating .... thanks Brun!