As to figuring out what other pieces you may want to make, considering you seem to be going for a man made structure, I would suggest looking at the D&D adventure, Keep on the Shadowfell. I think they get to the actual dungeon part around page 40. Though before that they have a map of a kobold hideout. Here:
http://www.wizards.com/dnd/files/H1.pdf (I would make a link, but I'm using my Ipod right now).