The thing is... a ship like that is not very practical... Harder to manouver left or right in a foward flight cuz less leverage for the turn cuz smaller distance between center of gravity and manouvering thrusters. Also it is space but it is not always empty, we have gas, nebulae, asteroids, so you still have to think something like "aerodynamics" on a ship to pass through these stuff, so a long ship is always preferable than a tall ship.
![[Image: 5mznGdQ.png]](http://i.imgur.com/5mznGdQ.png)