Hey, I painted an A-20! My old wood-burning software can't open the paint kit, but I managed it anyway.
It's a little unusual, in that it has American Olive Drab upper surfaces and RAF Sky under surfaces, and aan RAF-style aircraft letter instead of USAAF-style squadron codes. It's from the 15th Bombardment Squadron, the first 8th Air Force unit to enter combat.
I used the base textures supplied with the model and borrowed the sky under surfaces from one of Steve's paints. Steve, I hope that's OK with you. (I don't suppose you'll mind, but I won't upload it until I get your answer.)
You can't see much of the undersides in the screenie, but you get the idea.