One of the most critical components of this build was simply the rack upon which the costume was built. It made it so easy to roll out into the driveway, lock the wheels, spray a gallon of paint, and then roll it back into the garage to dry. You can't tackle this without one.
I took collapsible hinges from Amazon and attached them to the aluminum backpack. I ran heavy gauge L-bar aluminum forward and connected it with a scrap of steel tubing. This formed the main mounting structure.
https://www.amazon.com/gp/product/B002UC2UTK/ref=o...
Next the neck was fabricated using Rod Ends, aluminum round rod, and other metal stock. If you're trying to build this, the best thing you can do is decypher the photos for the rough geometry. These were the key parts that made so much motion possible on multiple axis.
https://www.amazon.com/gp/product/B00CF6AWMS/ref=o...
I then mounted a backup camera system since I knew there was no other way I would be able to see. THIS WAS THE BEST PURCHASE OF THE ENTIRE BUILD!!!! Able to navigate pretty easily even in a night club with zero external view holes.
https://www.amazon.com/gp/product/B009RIK3EO/ref=o...
I powered mine via a portable laptop charger that has a 12 volt output.
https://www.amazon.com/gp/product/B00HFMUBYG/ref=o...
You can also add cooling fans which are powered off the same battery pack
https://www.amazon.com/gp/product/B002NVC1DS/ref=o...
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