Based on the mesh of the Republic Light Cruiser, I present the Arquitens-class command cruiser as shown way too many times on Star Wars Rebels.
The engines and turrets were completely redone from scratch according to reference photos. I've tried to include as much detail as possible for larger prints, such as bridge windows and engine vents, but it still lacks much in terms of greebles.
Update: I've uploaded a more detailed V2 verison which should look better, but it's still untested.
The turrets need some support from the build plate, though it's likely to snap off the barrels when being removed so be careful.
If slicing using Cura make sure to enable 'Union Overlapping Volumes', 'Extensive Stitching' and 'Keep Disconnected Faces' under Settings -> Mesh Fixes for best results.