Nova assets are all in the lotv dependencies.
None of the assets have dedicated units by default, so you'll have to search for them. Defenders of man are nicknamed DOM(name) and nova units are nicknamed (name)blackops in the model section of the editor. Nova is one of the few with an actual unit, though she doesn't use a model without editing.
Most if not all the new doodads are all nicked Nova - (name).
Hope this helps yall. :)