The basic design is a shell spinner. The stainless steel dome will cover the robot and spin rapidly. I'll attach some sort of teeth to the dome to do damage, or maybe an undercutter. I haven't figured that part out yet.
Anyways I don't know what this is for, I'll assume like battlebots maybe. I would take ideas from Blendo which was made from one of the Mythbusters guys. Pretty similar to this.