Looks good! I am happy to hear about the lighting model, too many titles are bloomed to death these days. Speaking of lighting and shadows....
Camouflaged RAF biplane fighters were painted in a 'shadow scheme' so that the top wing wouldn't cause a huge difference in camo colour appearance due to the shadow it cast on the lower wing and upper fuselage. I'm on the road now but I'll post a scan of what I'm talking about when I get home. Until then, let me just say that the upper surface of the lower wing of a biplane fighter would have been painted in camo colours of a lighter shade than the upper surface of the upper wing.
The colours were official and were (in the case of the Temperate Land scheme like the Gladiator is finished in above) Light Green and Light Earth, to compliment the Dark Green and Dark Earth used on the rest of the aircraft.
The examples following are swatches from the Simmers' Paint Shop website, keep in mind these are modern FS595 colour equivalents, not the original, official colours, as they don't exist in any colour charts anymore.
Dark Green:
Light Green:
Dark Earth:
Light Earth:
When painted in the lighter colours, the lower wing would appear 'the same' as the top wing when in shadow. You can see the effect in the Gladiator screen shot the shadow makes on the lower wing, the camo colours look too dark in the shaded portion and stand out too much. This is something the skinners (myself included) will be on top of once the sim is released, but I thought you'd like to know.
Thanks for all the updates!