Hmmm. This feels likea transport of some sort to me. Interesting idea, but something just does not feel like its finished yet, and I am not talking about textures.
Couple of ideas mabey if you don't mind:
-Change the Engine from One to Three, lay em out something like the Space Shuttle uses only inverted with two main nozzels over the thrid.
-Take off those Hex looking side things. Their angle and look just does not seem functional or right for this.
-Depending on size of this thing, I'd almost say its a Passenger ship of some sort, if you set the side 'window' to be flush with the hull, that would look real keen.
Just my opinions of course. Still, does not look to bad, and with all the massive new variaties of ships out there, the one we do not see much is simple Passenger ships, although Liners fill that ole on a Cap Ship scale.