ok, for the Sovereign, i want to try something new, i found some Concept sketches by John Eaves, i like them, they have a impulse engine where the saucer shuttle bay is, bigger impulse engines, less torpedo tubes(i allways thought 10 torp tubes were overkill) and a different aft shuttle bay. Let me not forget the different nacelles.
Go wild
(it is the last ship on the comparison chart)