Ok, here are some updates.  As you can see the lower neck is thicker and longer now.  I thickened up the nacelle, mainly cause with the thicker neck, the nacelle was too thin for it to rest on.
I also made the upper neck connecting to the engineering hull.  However, after looking at a picture of the actual Kelvin, I might try and design some sort of connecting junction, so it doesn't look so plain.  Also, I might modify the forward upper torpedo launcher to integrate into the new neck.
So this ship isn't completed yet, but somewhat close.