Nice! sorry for the late comment but us at the Dystopia group would really like you and your building talents to help us with the spearhead consortium go to the group to check it out and no. Its not in a Brikwar.
Not bad for your first DF Moc. However, I recommend you take off the elongated front section, and then it would look better. In otherwords, it's a bit too long for my liking. If you like it, hey, that's fine. It's just a suggestion.
A real good overall look and design, it looks really massive. You have done a great job on those guns and I really like the opening hatch mechanism. And I think the different colours work fine, it looks like a camouflage paintjob (I'm not aware of the DF rules regarding colour or shape...)
I like the amount of playability you put into this. The overall build is pretty good, but in the future I would try and use all of dark grey or all of dark bley (one or the other), and a little less red. The differences in the grey make those areas stand out and deviate from the moc as a whole. Good build anyway!