Well, the neck looks skinny, you should widen it at least to the double of it's current width. Also, I'd take the top "shell"s shape on the side ortho around the deflector as the continuation into the necks front , and ad a sort of "spine" extruding from the aft of the neck backwards. Would make stuff a lot more streamlined. Also, I'd add some structure to connect the deflector housing with the inside surface of the top "shell" of the sec hull, like a continuation of the neck that's the with of the current neck, would make it look more sturdy that way.