ABSOLUTELY STUNNING!
U.S.S. Khambatta is truly deserves to be among the Enterprise line!
And to tell you the truth, I like ALL the versions you have pictured. The Purple deflector with green photon tube glows gives the ship an etherial quality I think is really original.
The second version with the dark blue tones makes me think of her as being more advanced, more experimental with technologies somehow.
And the newest version with its lighter tones does (IMHO) look more like her sister ship, Enterprise. Gorgeous.
I know you aren't as happy with her earlier incarnations but I think ALL THREE are more than worthy members of the Enterprise Class. And if you decide to release any of those earlier versions, no one here would object. Of that I am sure!
. You could call them your Khambatta Prototypes 1 and 2 perhaps...
Congratulations, Willarddcker! You have outdone yourself.