It's nice and clean
I wouldn't like to have the same cannon though... I'm pretty sure I would sometimes hold it the wrong way (And have a heck of a pain in my shoulder)

From the other picture, I got the impression that it stood about 2ft high.

I think it was not the same launcher on the other picture you're talking about (it seemed like white PVC)

Maybe we could see some damage pics ? (Well, not of the tank of course xD)
That's some really nice work.
But one ...