Matty, to shear of a panel of TAN any robot will be hard pressed.Even SOW ot Typhoon 2.
No,the frame is the chassis, and everything is welded completely.Even the softer welds are about 300NM/mm², and the total length and thickness are a lot of mm²

About the wheels. its about impossible to destroy one of those so it cant act like a wheel. part of the idea. A disk will grind into it, rip out pieces, but it will still be able to put any resemblanvcce of drive on the floor.