These are the current files for the 1 pound plastic fighting machine called "Plastique". I will post full parts lists and additional instructions, but for now I thought the parts would be of interest.

The only video I could find of this robot winning (it doesn't win much, it usually turtles) https://youtu.be/5kx_2t19lqg

Drive motors: N20 50:1 (or similar) x2 https://hobbyking.com/en_us/brushed-motor-15mm-6v-20000kv-w-50-1-ratio-gearbox.html?wrh_pdp=2 Tires: Lego small, wide tires. Photo included Weapon motor: Hobby King "Donkey" brushless motor. Example: https://hobbyking.com/en_us/hobbyking-donkey-st3511-810kv-brushless-power-system-combo.html

I've used an assortment of brushed motor ESC for drive and brushless ESC's for the weapon. Any standard small combat robot ESC's will do, the smaller the better.

You'll need an assortment of 4-40 nuts and bolts. At least 15cm of 6mm steel (or something) rod. 6mm ID shaft collars x2 (one for the top and one for the bottom) Small Reciever, bot requires 3 channels (2x for drive 1x for weapon) One light duty spring, approx 1" diameter. One 1" foam (or other) tire for the weapon drive.

The shell does draw a lot of current spinning up, so a larger battery is better. No less than 250mah for 3 minute battle.