I am working on one which is more or less similar.
If I can make a comment, from a mechanical point of view, the bridge between thrusters and operational part should be centered on the thursters (it may generate an awful torque otherwise).
I would recommend giving the two parts more connectivity than that one tenuous-looking ‘bridge’ – it looks like it would snap under lateral pressure, and it’s a weak spot for an attack ship (if it is an attack ship). It would also give it a more streamlined look if more was added to the middle. Unless, of course, that middle part held containers or smaller ships, which would work pretty well, depending on the size of the ship.