Not cast, but certainly understrength for fatigue cycling (I think I'll inspect the one in my 91S soon).
The door handles, yes. Alfa cast door handles, both inside and out, have always cracked. My Sprint GT had outside handles break, but I learned how to repair them without it showing. Alfa door handles ever since have always been suspect, cracking now and then, esp if manhandled.
1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27
previously owned since 1964:
62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6