I love the Proto-Nebula pack. Only thing that would have made it better is if the cannon square deflector was on it instead of the Galaxy kitbash one. But oh well.
Cant wait to see the other pack.
EDIT: I'm not sure if this would be classed as a bug as you may have done it intentionally. Then again, it might be a bug. But the smaller nacelles don't seem to be set up as warp engines. As in, they don't 'flash' when going to warp and they don't leave a plasma trail when I vent plasma.