tricky how? and if you want; you could do an TMP style deflector dish; not like yours of course, because then it would look too modern and unbalanced as an whole....
As for the nacelles, I want them to match the rest of the ship colorwise, and have the fins on the back be black.
I want this to look as much like an second phase refit as possible; while at the same time keeping the overall look.
As for the background, I found this [link]
now for the full story behind my refit Enterprise. You already know how it came to be in the real world; but in my Star Trek universe, it comes from an parallel reality.
In that reality, Starfleet is much more advanced technologically; as they are able to send out temporal agents to observe and the different realities that are interconnected with their own.
When they came across the prime timeline by accident, and the JJ verse respectively; they then decided to build an refit Enterprise that combined elements from all 3 Enterprises into one design. They then called this design the Mark II.
About a year after it was built; Starfleet gave command of this ship to none other than Jamie Tiberia Kirk, only grandchild and namesake of legendary Starfleet Captain; James Tiberius Kirk.
There are those who would say, in her days at the academy; that besides being an mirror double for her famous grandfather, that she was just like him in personality and actions. That suits her just fine; as he was her hero growing up.
However, unlike him; she never had to cheat the Kobyashi Maru, as she beat it by her own merits and creativity.
Once Jamie took command of the Enterprise; the ship flourished, and the crew became loyal to her; like an extended family of sorts.
However; five years after her initial refit, she was recalled to the San Francisco Fleet yards above Earth once more; where she was originally built, to receive a major refit to her nacelles and deflector dish; as Starfleet had just finished building the prototypes to both systems and wanted to use the Enterprise as an testbed.
This is where those nacelles come in....