The blue ramscoop/deflector on the upper nacelle coupled with the seemingly red one below is strange, but maybe there's a reason. Even if there's not, oh well. Its still a cool ship. I WILL be a little put off if it turns out to be a deflector dish on a nacelle, though. That's... odd.
I don't think they're both nacelles. The upper structure looks to me like an engineering hull with a forward deflector dish, while the bit of red-orange thingy we see below looks like part of a nacelle-cap dome.
Am I the only one who wishes the registry number of the Kelvin