So, for a village started above ground, as I understand you can extend your village's perimeter into a cave. Is it possible for the opposite to occur - wherein your village, made in a cave is extended to the surface? If not, that would behoove us dwarven builders immensely; or if we could have Charter Stones set inside and crops able to be kept inside that would prevent us from ever needing to leave our mines!
Food for thought.