Make the nacelles more like the secondary hull ending in antenna farms
You know--one of those alien video games whose title I have forgotten, where they made organisms that look like AT-ATs walking around--had something similar.
To me USS Vengeance is a good place to start.
Nacelle supports more gull wing like, a bigger saucer, lower down with high nacellse for a souped up look.
My perfect fan boy wish list--a refit era ship with those modifications, but with Super star destroyer complexity