There are two Novas in the Legion, that I know of. I don't think I have any really good pics of my armor. Took them for the CRL and they came out all fuzzy going to be able to try again tomorrow. Yes, it is fully approved it just has the yellow square because it's missing the full model photo and is therefore not "complete."
Best way to make an FX bucket a nova is to sand it, paint it black, make sure there is enough tie for the paint to cure then paint the striping.
-iz