Okay.
I've done a rudimentary star drive which can give me some good ideas about the positioning of the Nacelles/Saucer/Secondary Hull.

I like it.  
Engines seem a bit on the large side in comparison.
Don't like the engines blocking the neck.

There is a real mixture of TOS in this view that I really like.  The placement of the engines is striking here and I like the shape of this star drive profile.  
It's not girthy but that maybe a down side considering the saucer.
Thoughts Anyone?

My immediate impression is that I don't like that the black line of the two other nacelles isn't visible.
Do those engines look like eggs to anyone else?

I really like this angle.

The shot that made the Constitution II Famous.
It looks really nice here...

This shot concerns me the most.  It's the angle the ship will be viewed the most at.  As a tall ship (as most TMP era ships are) This shot has to dominate.  The Galaxy the Excelsior and the Constitution blow this angle away....and I'm not liking this one.
The Nacelles...
I get the feeling they are too close to the saucer....too big....and high....
I'll save this version and undo back to a point and continue crafting the stardrive.