Thanks, everyone!
Buckeye, Joe - the OD is Tamiya acrylic in the bottle (I think it's XF-62, but I'm at work and can't see. Anyway, I'm sure you know the one I mean).
To get the shade lighter, I first sprayed black, then sprayed a base coat, then sprayed a coat that was 50 percent OD and 50 percent white on the insides of the panels. Then I finished it with a coat that was 70 percent thinner and 30 percent OD. That keeps it from being too dark and gives it a little definition in the panel lines.
Buckeye - that is a nice job on that. I love the two-tone finish.