WOW. That is one huge ship!
I'm absolutely loving the saucer design. The overall shape is great, and the accented hull lines are very slick. I'm not a fan of the warp nacelle or pylon design (in fact, I think they really spoil the look of the ship), but they're sized pretty nicely. Personally, I'd make the nacelle pylons more in-line with the Sovereign design than the Galaxy design. That way, they'd really compliment the slick, swept back lines of the saucer. Maybe removing more of the hull between the pylons would do the trick.
I know it's a little late to be talking about the design, but now that I see how nice this ship is going to be (especially with the saucer design), I thought I'd pay this ship a little extra attention. ;)