I like the job you did on the tracks. Overall I doff my cap to you, sir!
The only thing I did see that I'd like to call your attention to is the slight silvering on the decals on the front and rear mud flaps. That happens when air gets trapped under the decal. Next time shoot a gloss coat over the whole thing (not just the parts that will get decals) and let it cure for about 24 hours. This will give the decals a nice, smooth surface on which to lay down. Once the decals are dry hit them with another coat of clear gloss to protect them from your weathering.
Once you're done weathering you can spray the whole thing with something like Testor's DullCote to take away the shine.
But still, I think you did really good. A bunch of us are going to go out and pick up that kit now.