Crosswinds are not a problem, beleive it or not! They are very stable, beating a lot of cars built 30 years later :-)
And, Reidar, don't laugh at our aerodynamics, either. A Cx of 0,39 is excellent for a late 50s design. Look at the following list and you will see... (remember, the lower the Cx, the better).
Fiat Ballila 0,60 –
Lancia Appia 0,57 –
Vauxhall Viva 0,52 –
Fiat 128 0,48 –
Daf 33 0,48 –
Ford Mustang 0,47 –
VW 1200 0,46 –
Jaguar E 0,44 –
Lancia Fulvia Coupe 0,44 –
Fiat Dino 0,43 –
Mini Minor 0,42 –
BMW 1600 0,42 –
Ford Escort 0,42 –
Fiat 125 0,42 –
Fiat 127 0,42 –
Fiat 124 0,41
Ford Capri 0,40
Peugeot 504 0,39
Renault R4 0,39
Mercedes 220 0,38
Alfa Romeo 1750 GT 0,38
Austin A40 0,37
Maserati Ghibli 0,35
Porsche 911 0,34
Alfa Romeo Giulia 0,34