Alternate design for the Destroyer, with a more cruiser-like features to it. I particularly like the "skeleton" feel to the prow (like Starcraft BCs), gives the ship a more industrial flavour, as opposed to the more spartan (haha) Frigates. Playing with some concepts here, including a much bulkier engine guard (Destroyers are supposed to be doubly-armoured than their Frigate counterparts), to make it look less "elegant" than the Frigate. A movable crane-truss thing I'm already experimenting with on the Falling Star for the Pelican landing pads, again with the already-mentioned canon that Destroyers do not possess single-ship hangars (and dedicated Pelican bays would be illogical at this point), although Pelicans would still be required at some point for personnel transfer and Infantry recovery (Destroyers still seem to deploy ODST HEVs) Also more engine/fuel/coolant because of the destroyer's extra mass, which gives me the excuse to add Halycon-style pod things at the back.
Apparently the Destroyer designs are more oriented to space-engagements than ground support (as in the Frigate's case), hence a less aerodynamic shape and bulkier components (due to the added armour and weapons). Also hadn't thought of the use for the underside-thing (On the frigates they are used to deploy troops via giant elevators). Since the apparent role of Destroyers is more on space combat.