I love how most of the compliments for this is "it's ugly. Good job!" It's a pretty solid design. I like the stabilizing bar on the side. I makes it feel like it extends or adjusts to some sort of flight requirement or something.
It's got a nice mechanical look to it, but the right side seems too smooth while the left one seems too blocky. I'd suggest switching up a few details to make the overall design more coherent. Still, it has a very realistic feel which I like.
Symmetry be dammed! Awesome ship, man, the shape is unbelievably cool. I love that rear wing and the missile pod. You should post the original drawing, it would be cool to see what this beast is inspired from.