I'm not exactly a new modeler, and I've got some non TOS ships in various stages of completion. I have a couple X Fed ships, the WIP shots can be seen on D.net.
As for the deflector, I had to size it down due to the fact that at anything really larger than what it is now overpowers the rest of the ship, which I feel takes away from the ship. Remember, less is more at times.
As for the neck, I made it that length purposely because I wanted a little distance between the nacelles and the main saucer section. Also, due to the torpedo pod, I wanted clearance for torpedo firing.
The nacelles were made by Fallen_Warrior, and yes, they are sexy.