So, this was quite the involved build. My challenge was to make the Egg Walker from Sonic Adventure 2 in scale with the Jazwares Eggman figure so he could sit inside it. I found a ball 4 inches in diameter (to be specific, it was one of those Magic 8 Ball variants, one with emojis) was the right size. I cut into it, removed the mechanism, installed some legs made out of bionicle joints, foam board, and craft foam, and made the turret out of some random lego bits and a chapstick tube. There is a little seat in there and the leg's internal supports hold his feet in place, so Eggman IS properly seated inside.