Probably the only suggestion that I would offer for this model would be the warp pylons as well. whatcha got there looks good but warp pylon need to be fairly straight in the front view. Theres the jeffies tubes, access ways, power conduits etc. that run thru there, so you want to make it easy to get to for the maintenence mechanics. A gentle arc might be good, but straight will be the fewest in polys.
Im a part-time aircraft mechanic so I always think about the mechanics job lol..
The engines look great - Id keep the red. I always look at the engines first
also very nice texture work too.