Looks pretty sweet.

Tornado Walker, aka the Cyclone(seriously Tails calls it that). Looks pretty damn good though

Very cool. I loved this war machine in Sonic Adventure 2, kind of wish it made it into more games. I noticed when you first see Tails flying it you can see a "2-A" marking on it, I think it was supposed to be an upgrade of the Tornado 2. But this and Robotnik's Egg Walker (or as I dubbed it the Egg Chariot) were pretty cool to play with in the game. Kind of sad as to how little art there is for this.

Not enough interest in giant robots from the Sonic community is why. :P