My half baked entry for the weapon category. If you need any clarification just say and I can come up with a diagram or something.

Name: Poison Ivy.

Shape: Irregular pentagonal prism (think house).

Weight: 100kg.

Dimensions: 70cm*70cm*22cm(l*w*h).

Colour: Ivy pattern body with orangey/red bar tips.

Locomotion: A rubber coated aluminium hemisphere attached to each side of the bar and a pair of cams to tilt the robot. Tilting the robot changes the hemisphere's contact angle so causes the robot to move.
(If you don't like that the hemispheres could be made from nylon and attached to the chassis. Tilting the robot causes it to move via gyroscopic precession).

Drive power: The cams are powered by a 24v DeWalt Hammerdrill run on 36v geared down by some ratio to give about a 40mm range of motion (20mm up 20mm down) quickly. They're run like servos.

Ground clearance: 25mm

Batteries: 4*10 cell A123 M1 packs in parallel (basically 4xDeWalt DC9360).

Armour: 30mm thick FR4 Glass Reinforced Epoxy (pcb material) top and bottom.

Weapon: Ti-6Al-4V bar with and s7 tips (2kg each) powered by a Turnigy 80-100-A 130Kv Brushless Outrunner on 36v (4500ish rpm, 1m long, 50kg including tips).

Speed: Some :P

Turning Circle: 0m (I think).