A couple weeks back I was asked about doing another tank sculpture. I had done the M1 Abrams a few months ago, and a similar look was what was desired. You can see the first one here.
I changed a few of the lines a little bit, and played around with a different way to raise and lower the barrel. The friction is adjustable, so that it moves stiffly or freely. The turret rotates 360*. Here's the latest "Hot Rod" Abrams: