Well CIM, I would have to disagree with you on this one. The whole point of the CG world is to unlock creativity and begin to think outside the "box". The only time when you have to model something that really works or is practical is when your doing industrial design. Other than that the only thing that counts is making it as bad ass looking as you can. Besides, a practical spaceship...well, you can only model the space shuttle so many times before it gets old.