If you're worried about people disassembling them, then you're probably better off not colouring or naming the meshes. The kind of people who'd buy spaceships etc. wouldn't be bothered taking a mass of grey meshes apart, I think. But for your own convenience it's best to colour and name different mesh groups. Otherwise it can get VERY confusing. That's a very threatening, workmanlike spaceship you have there. Like it lots.