Weapon mount. I agree that the weapon mount would be better placed closer to the ship main axis.
Simplified engine. If you go with the radiator idea it might be necessary to simplify the engine in order to not overdo details at the ship rear. This is completely circumstantial and may or may not hold depending on the applied texturing. Additionally if the internal engine does not stand out of the outer one the shape line while looking from top will be more sleek.
Simplified arm-wings. At this point I honestly don't know which wing arms I do like more - blunt ones, current ones or the proposed sharp ones. Current ones give a distinctive style to the ship and possibly the shipline, while sharp or blunt ones are less radical to the first look.
Weapon mounts - I would prefer to see them perpendicular to the long axis of the ship, but that is mostly esthetics. I am also a big believer in having non-turret guns forward on the hull, but that is just me. (right hand side of the image)
Engines - I rather like the more vectored look that comes with the ducting across the thrusters, but, again, personal preference, not because of any specific idea.
Forward wings - I prefer the simplified hook inward (left hand side in the image)
