On the Paladin, everything just works. The parts just look like they were meant to be together. One thing you might try. Do a stock Excelsior with the Excelsior parts, but use Paladins nacelle supports instead. I've actually not seen a stock Excelsior with those parts.
Those Paladin supports, The Valhalla saucer atop the Yamamoto's neck on the Prometheus body might look interesting.
The Republic is just divine. You have done more with different impulse layouts than anyone else did with Jaynes type designs. Very fresh.
Any aft views?