I do agree about the impulse engines though, and I'm intrigued by the suggestion of inverting the deck to the underside of the saucer. However, as a purist myself, I have to disagree slightly with Koloth Kinshaya about the impulse deflection crystals being over the feeds from the M/AM reactor. The Deflection crystal does reformat warp power to Impulse, but it does so before it goes into the imoulse engines. As long as there is a conduit feeding power into the crystal, we could say that the conduits are routed through the V-neck and back into the impulse deck. However, with the third nacelle on the centreline, It would be best to have split impulse decks. I'd agree with a large central exhaust port and two smaller outboard ports.
Okay, working from memory here...
The reason it's called a "deflection crystal" in the first place is that it deflects the energy from the M/AM reaction into the impulse engines, where it's converted into actual impulse movement. I recall the same source citing that the impulse drive is surrounded by fusion reactors, which could be used as an alternate energy source for the crystal in the case of warp-core ejection / saucer separation. Matter / Anti Matter reactions are considered better for the impulse drives, due to the sheer energy being produced.
And, IIRC, one of those little diagrams on the movie bridge shown the reactor core stretching straight from the impuse deck, down the back of the connecting dorsal, and into the upper half of the secondary hull, leading to the pylons, where the core splits into 2 channels, one up each pylon to the respective nacelles.
Using that "science", the V-neck design requires 2 cores up the supports to the saucer, where they'd be re-channeled in the saucer's rear to meet at the centerline, where a conduit would run into the center warp. Dizzy's current design would "work" with that technology (they added taps in the crossmembers), though I'd prefer to see either a semi-TNG-ish arraingment (impulse decks above the pylons as beforfe), though upon further thought, a newer 3-vent deck, with the crystal half-buried under the support pylon, could work...
And Scottish Andy, I just changed my name for the current KCW server, I'm usually Julin Eurthyr (as attested to in the little blurb under the Koloth name...)