I think the composition is great. You always have something at the front of the mix, and that makes it consistently interesting to listen to. I think the vibe of the track fits what you described very well.
There are some things I think could be improved. First off, that bass guitar is way too loud. It muddies out the rest of the track and sucks a lot of energy out, I feel.
Secondly, I feel the same way about the hi-hat. The hi-hat is pretty piercing, so it can be just a bit quieter. This allows the other high-end parts to shine through just a little bit more.
Finally, I feel that the rythm guitar could have more impact if it wasn't panned off to one side. It's a pretty important part of the groove, right? So therefore we might want it to sit in the center of the track. Even better(in my opinion), is another thing you could do to make it feel even fatter and more real. You can clone that guitar track, and pan the clone over to the other side. Then, move the cloned track forward on the timeline juuuust a little bit, so it always plays a bit after the first guitar track. This emulates the typical "double tracked guitar" sound that's so common in heavy metal, and makes it sound really fat.
So yeah, that's pretty much it for critique. Turn down the bass and hi-hat a bit, and put the guitar in center or double track it. Those are just suggestions though.
I liked the song, and it definitely made me imagine a hangar full of scrap metal and smelling of gasoline. Good work!