If you do keep that TMP Kelvin kitbash, I would re-build the impulse engine section as it doesn't suit it.
I would change it as I don't like it myself, took me two minutes to throw together as a concept idea.
They will either be as is but better fitted, or losing the crystal and going back to the saucer rim.
Its too bad that you arn't doing any TOS ships. Would've been awesome to see a TOS Kelvin. Ah well. 10/10
Never say never, I'm more of 23rd Century guy