This is hardly a cool spaceship. The boxiness, the oddly placed roof structures, the spam cannons.
The only thing that looks halfway decent are the engines.
Also while there is no air drag there are small amounts of particles, and of course when you get nearer to anything that isn't blank space you'll be at a loss for efficiency. I don't see how future peoples capable of building space ships would lower efficiency for no real reason.
It's supposed to look cool, not be all scienecy and realistic. Here is a cookie maker of this awesome shuttle.