One of my favorite toys as a kid was a Krazy Kar. When my own kids were little they also enjoyed the Krazy Kar. Unfortunately, an adult sized Krazy Kar isn't sold so I decided to build my own (photo below). The frame is made of wood and the wheels are "garden cart" wheels that have bearings built in.
Here's my daughter racing around the nearby North Carolina Arboretum drop off area at the end of a "science fair" where we helped exhibit with the gang from Asheville Makers.
Not long after building this adult sized Krazy Kar I started thinking about building a robot costume on top of of Krazy Kar. I built this for Maker Faire Atlanta 2015. In the video below I'm using the costume on Vermont Ave in Asheville, NC during Halloween. My wife Anne is walking beside me and she's playing the part of the wacky inventor. Anne's holding a shoe box prop made to look like it's a robot controller (she fooled a lot of people with that!).
Here are a few more photos of my robot in action during halloween.
Here's more video of my robot costume in action during halloween 2018: