While I do love the design, right now it seems way too similar to Tansie's Greyhound model. Perhaps replacing the two engines with one big one stuffed in the back with intakes both on the top and bottom would be a fix. Would be something the Rogues would do, I think. Want a fast ship? Strap a cockput to a bigarse reactor and engine.
EDIT: On reflection though, Tansie's greyhound might need a small update as well, who knows.
Well, I meant the overall shape. Granted, there is no fixed shape for the Z line, but in general the LF model above seems a tad greyhoundish. Which is not bad at all when it comes to gameplay, since it is a very sleek profile very close to that of a Libby, but still, thumbs up.