I really like its overall lines, very sleek, and I love the cockpit windows. However, that flat outer edge looks aerodynamically problematic... I would go for something much thinner/sharper and rounder (I'd avoid 90 degree angles)!
Remove the gun from where they were. You have an idea where they should be in the picture. I did the top panels, the front logo in glass/diamond material.
Put the side turbines that makes this space movable. Change the curving at the back end of the ship, to give it a smoother line. Change the front logo color so it is more visible.
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full image:
http://www.3ddub.net/wp-content/gallery/sketches/glide13.jpg