Yeah, three layers. First, paint the interior flat black, in order to totally block light. Next, paint a layer of silver. Silver covers well and will act as extra insurance in case your black was not as full coverage as you thought. Also, it's a better ground for the white as the white is always a little translucent and will not look as bright if just sprayed over black. After your black is dried, and your silver is sprayed and dried, then finally spray your white. I recommend gloss white as opposed to flat. a nice even coat of gloss white over silver will appear bright and will reflect light very well. When picking lights, I recommend either light sheet, or super white LEDs for cabin lights. If you're using conventional bulbs the result is a very dim yellow colored light which, on models of such small scale, looks like the interiors are lit with torches! Plus bulbs burn out, LEDs last practically forever.
--Alex