Just a question/suggestion...
Is it too small to mount a Phase Lance/Assault Phaser instead of having the Captain's Yatch (if that is what's on the underbow?)
Or would you consider such a weapon the realm of Dreads only and not BattleCruisers/Battleships?
The Sovereign class starship was introduced in the late 24th century, showcasing some of Starfleet's most recent technological advances. The Sovereign Project was one of the new defensive technologies initially intended for use against the Borg threat. The prototype USS Sovereign was still in the design phase during the Battle of Wolf 359.
Heavily armed, the design philosophy for the Sovereign class was shaped by the discovery of the Borg. The Sovereign Project attempted to push the envelope as far as possible when it came to computer power, shields, armament, and systems capabilities. The Sovereign class starship combined the creature comforts associated with the larger Galaxy class vessels with the tactical power of the new Prometheus class. (Star Trek: First Contact)
The vessel included some of Starfleet's most recent technological advances. Primary amongst these was a large
quantum torpedo launcher mounted forward of the deflector dish above the captain's yacht, which was capable of firing at least four rounds per second. Backup to the quantum torpedoes was provided by photon tubes; four of these were located at the base of the engineering section in pairs which face forward and aft. These launchers can fire up to 12 torpedoes at a time. The warp engines of the Sovereign were of a new design which eliminated subspace distortion effects inherent to standard warp drives without the use of variable geometry nacelles (as found on the Intrepid class - see also Hekaras Corridor).
http://memory-alpha.org/en/wiki/Sovereign_class