I'm building a car pc never done one before, the problem is because of fear of theft were I live, I need to have it as discreet as possible when not in use (parked outside) has anyone else had this problem?

Anyway I'm looking for the smallest case possible that is compatible with Epia MII 120000 board the 'Morex Cubid 3688' would be good, is smaller possible . It needs to fit a '3.5" Hard Drive' though, with the 'Morex Cubid 3688' this isn't possible.

I'm not having an optical (CD/DVD) drive installed so does anyone know if I can fit '3.5" Hard Drive' in the 'Morex Cubid 3688' or similar or even smaller case.