I don't like the 725m size, but if that's what they say it is, that's how big it is.
I will say that I don't like the design, particularly the secondary hull. The saucer looks too far back, cramped against the nacelles, and the cutaway on the lower part of the secondary comes way too far forward. It looks unbalanced, with too much visual weight on the front of the secondary hull rather than the saucer.
As for the "Dreadnaught," it looks impressive - though I do wish JJ had thrown in that third nacelle as a call-out to those of us who cut our teeth on Franz Joseph.