Yeah, with some refinement, that might work.

Is the saucer meant to be an oval, or circular?
Refinement?! Man(Mad), I spent at least 5 minutes drawing this thing!
Seriously though, I would say oval, just because if JJ's would probably keep such a recognizable design element. I guess. But it would be a flatter hull, as opposed to the curved organic look. That would go to the nacelles and struts. Those struts are a little long looking, and the nacelles would remain cyclindrical.
But she is bigger then the E-D. I'd say at least 1200 meters, but not much larger or smaller then that.
Ordinarilly, other then a Romulan or other Alien ship, I would NEVER EVER EVER make a Federation ship much larger then a Galaxy Class ship.
One more note- The ship has 3 Defiant Type (the 4 deck, 120m version) ships embedded into the underside of the hull (like the Captains Yachts). 2 on the primary hull, and 1 aft, between the warp nacelles.
She's a long haul ship and that allows for some serious exploring and makes her super safe!