I'm going on hearsay here, but I remember someone running batch of a ship or vehicle and assigning a custom image to that lump of DC uses. That way as the entity was produced, it had the custom image instead of the stock one. Is it possible to do something like that? For example, I want the next 12 X-34's that Aratech produces in this factory to come out with X image, thus setting apart Aratech 'brand' X-34's from Ubrikkian Industries'.
DCs are only allowed one custom image, and then the image or the original can be chosen. Replacing an image erases the old one, and changes even previously built items with the old custom. However, the option had disappeared last time someone asked about it.