Thats a very busy looking deflector, they've just started using deflectors like that in StartrekOnline for the latest prototypes, but I do like the sort of delta-wing you've given the nacelle pylons in the ventral view.
Nacelles a little too JJ for my liking, but overall she'd sit alongside any federation starship of the time without looking too out of place.
Best stick an NX number on her though, she's clearly a younger ship than the connie, or even the canon connie refit with all the curves and streamlining.

Have you done an updated Miranda by any chance? Always prefered the Reliant to the Enterprise myself

The idea behind the deflector dish was actually taken from the Soverign class design. Never played Star Trek online, so I wouldn't know. Yes, the nacelles were partly inspired by the newer Abram's Constitution revise.
Eh...this is my own reimagined design. This is pretty much the norm in Starfleet design in the early years. If she sat along side the canon Constitution class, it would look out of place. Not to mention this version of the ship would be longer than the original.
Indeed I have. I have redone pretty much the entire fleet, stretching up to the Next Generation designs and then some. I even added a McQuarrie class based on a concept some people might be aware of. ;)

Looks a bit like the Enterprise C

A nice redesign, I would like to see more of these refits of yours.

You sure? There's a lot of them.

Sure, I've always enjoyed seeing others designs things like this.