Should be interesting. I noticed a couple things you might want to work on though. First, all the shots look like they came in at a 90 degree angle to the metal. If the attack came from above and the side facing us in this picture, the holes should angle down and toward the far side.
Also, the different types of metal would take damage quite differently. I'm no expert on the types of metal used for what, but cast iron, for example, would be more brittle and thus shatter more easily than , say, sheet steel. Again, I don't know what's what, but the louvres on the side there, it looks like they should be bent in more, or the plastic thinned or something. I like the way the piping along the top is bent where the hole is, althoughthe way it is bent upwards kind of makes it look like the round came from below.
Basically, all of this is kind of saying the same thing, but a few small changes that should be pretty easy to make would help the overall look quite a bit. I like the idea, and will follow to see how it comes along!
-----------Kevin