It's interesting to compare these two versions. The mkI was a "pinnacle of style" back in 2004, being of those ships that really showcase the classic SPACE MOC design. There is much more rugged transitions, bigger details and simply more "blocky" feeling in it than the newer counterpart. Of course, the original is still one heck of a ship but it just really shows how much the hobby has changed in six years.
After history lessons, let's get back to the new ship. I really like the smooth and small plane that you have built, it really looks like it's made for being agile enough to move around bigger ships and powerful enough to destroy the said ships if necessery. I especially like the the small, subtle details like the engine pistons near the front and the "hourclass" look of the engine. Perhaps that "hourclass" look could be more clearer but that might end up ruining the smooth out look of the ship. Somekind of "criminal version" of S.M.A.C could emphasize that "hourclass" look more?
Oh, and it's awesome to see that you have gotten enough time to build MOCs. I look forward for your next projects!