Hi Dave ;
One thing you Must remember .The North Cormorant is in the ocean .Salt is in the air and all around this beast .The panels need to be lighter at the bottom .Remember moisture runs down flat surfaces .
Greyish white to frosty white , letting the base colors show through . Also rust is places the crew can't get to to paint and clean .That's why the Navy had the Bosun's strikers swab decks in the morning .
Fresh Water washdown was used to just after arriving at port . Always figure in a salty environment , that everything will be faded in ways that also show wind and weather patterns .
Kinda like moss on a tree . T.B.