@Steve O B Have:
Very impressive work. I haven't really read this thread earlier, and therefor mist all your nice concept drawing. As someone else wrote, send in a job application to Frontier Developments immediately.
In what program have you done this? I'm at the moment programing my own 3D graphic engine at my spare time (mostly for fun) and are using Real3D wireframe data for the models. For the moment I'm using my own self made, ->very<- boring, models. And it would have been nice to have some nice spaceship models to twist and turn if you are willing to share.