One theory as to how warp uniquely works on this ship (when questioned):
This assumes the warp drive on this ship is similar to a Klingon B'rel-class in how it works, meaning the "neck-nacelles" aren't actually warp engines, but something else (perhaps some kind of new nav deflector tech that was experimented with, projecting a weak forcefield around the ship like how more-traditional deflector dishes would) I believe the reactor to coexist with the fusion reactors on the impulse engines, much like how I believe it to be so for the Klingon Bird of Prey (and her Romulan look-a-like counterpart, assuming there's one), taking some design tips from the aquired Bird of Prey Kirk got. The engines are also tied to the main pulse phaser weapons (or whatever these weapons are for this Federation BoP), much like how from TMP-on the main Phaser Banks throughout the refitted Constitution-class channels its power through the main warp engines (although would be cut off if the antimatter mixture were imbalanced). My guess would be that there would be that the main warp reactor/core is connected with the main weapons, for supplying power to beef it up. My guess is that for a ship her size she'd have no more than ten-to-twelve max for crew, probably tight-fitting quarters with bunks (plus one for the CO)...
That's how I'd imagine some of the basics...