Great work. I'm wondering about realistic designs for spacecraft. The only place I can go to for inspiration seems to be Serenity (except for anything else set in the very near future). Most designs are big cubes, or complicated impossible Sci-fi. Serenity, and your design there, seems to meet in the middle.
I really like the style you've put into this illustration. I didn't notice this ship in the film; I'll have to watch it again.
It's difficult to come up with new forms in that cliche "long box with engines at the back" format, but you've really done it!
On that note, if there was an "Art of Serenity" book, I'd definitely buy it