Eccoci - here we are.
My time this weekend will be limited, but I'll start going over the list - immediate thing I notice is Fiat G.55 Centauro as advanced WWII fighter. I believe the far more interesting, and more common plane is the Macchi C.202 Folgore (less than 300 G.55 flew in WWII, and some of those were used by the Germans, while four times that number of C.202 saw action).
Aaand, if you already have a Fiat Cr.32 model you should "promote" it to WWII fighter (yeah, we started with
biplanes!!) and use a Nieuport 11 or 17 instead.
EDIT (because Red Baron started an obsession that's still virulent...):
WWI bomber: Caproni Ca.3
Fiat CR.25 had a whooping service record of... 10 planes in active service. Savoia-Marchetti SM.81 would be a more "signature" choice (see below)
Reggian Re.2000:
if there has to be a WWII naval fighter (Italy couldn't complete the first carrier before the armistice), use the Reggian
e Re.2001, which was the planned one slated to be adapted (OR Serie II)
WWII Naval Dive Bomber: I propose you move to this slot the Breda Ba.88 and use in its stead the Breda Ba.65 Nibbio.
WWII Transport: SM.81 is better replaced by Caproni Ca.133
And now I'm off to lunch...
EDIT II: ...but not before mentioning that WWII should see the introduction of an Italian invention: the
human torpedo.