I went and joined the Atom Cats.
It took me about 6 months of spare time. it has animatronics that turns the head and lifts the eyes. Also a fake flame thruster. It has codsworth voice playing via Bluetooth from my phone and the control app is on the phone also. The main body sphere base was a plexiglass light dome that I applied fiberglass cloth to to reinforce it for strength.
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Here, have a shameless plug for the Fallout group shoot at Dragoncon, which is Sunday evening. All Fallout costumes are welcome.