In DE, the nomads aren't bound by territory restrictions at all (their CC casts a territory effect only to help out the AI; it can be removed if the AI is extended to deal with nomad civs). The only structure that can't be built in enemy territory is the Fortress.
Furthermore, their houses, storehouses, and ox carts can change into each other at-will. So if you want to move all of your houses elsewhere, you change them to ox carts and you can move them anywhere and change back to houses.
Along with Zapotecs they're in the wrong hemisphere. Just figured they'd be less likely choices.