When I looked at the different interior maps from cryptic in the foundry, I noticed, that the most maps are incomplete. For example Deep space 9 - where are the maps for Quarks, or the Ops?
Quarks and ops at DS9 are on the custom maps, Just a little hidden. I'd advise you to use the Social zone maps unless you need to place enemy npc's. When you create a custom map it comes with no NPC's, Custom Objects or Triggers. You have to design them.