Jim,
You did a great job on this.
FWIW, I paint my pieces too. I paint the hull of all my ships (except the subs) Navy Grey and the decks and superstructure the “nation” color. This makes a very nice effect.
I have not painted the Italians of my AAE40 set yet, but my nation colors are …
US - wood decks w/ navy grey superstructures
UK - Armor sand decks w/ aluminum superstructures
ANZAC - Forest green decks /w grey superstructures
Russia - who cares - Light brown
Japan - leave the decks orange after painting the hull navy grey and paint the superstructure aluminum
Germany - Paint the hull navy grey, leave the decks alone and paint the superstructures aluminum
I’m sure there are folks that have ideas for better nation colors or more imagination for the superstructures than aluminum, but something along these lines does add to the effect of painted ships.
I also paint my other pieces but the color scheme does not exactly match the ships. For Jaoan, I use IJN green, IJA green and Sand as colors for units. My Russians get a light brown. My US units are olive w/ other colors like brown boots and weapons. My UK units are armor sand and Aussies are forest green; both w/ brown weapons and boots.
Enjoyed it. Good Luck.