That looks really nice. I think it counts as the first HGUC Nu I've seen modeled. The gold looks really good and I think goes along with the white and black a lot better than the standard yellow.
Also, I love the extremely elaborate decals of the mg hi-nu, even if they're far off what was in the original hi-nu design. Plus their silver flows better with the black white and gold than does the bright red of the originals.