Excellent update! Wow, this is far and beyond anything I imagined was possible in this game, great idea!
EDIT - looking at the Brewster, I see it has grey undersides. According to my research, they were initially left in the factory applied silver-dope. At least some Brewsters even had the original serial codes on the wing bottoms. Later on, when some were serviced, they were repainted on the bottom with grey, covering up the serials as well. Not a huge issue, and I don't think it's possible to get codes on the wings, but it would be nice to see silver-bottomed Brewsters