His wheel had to be big enough to fit on a bike, so he started all of the work with some laser cutting based on a scale offered by James. He took some wood and put a bunch of holes in it to secure bearings with nails around the feet, which are represented by hollow aluminum square bars. This way, they could move up and down as the wheel spins under a human's weight on an uneven surface.
Colin proceeded to 3D-print some tiny feet that ended up attached to the end of the 14 aluminum bars with joints and everything. He then moved on to add the hub and the final product started to come together.
However, something did not work well: there were too many joints put on the legs that made the feet sometimes flick back. So he got rid of the feet and just kept the legs to which he attached shoes. He also put an elastic at the other end to pull all of the legs in.
Colin did have to extend the bike's forks because this crazy wheel turned out to be a tad too big. Nonetheless, the final version turned out to be a fine piece of engineering. To show that everything worked accordingly, he even tested the new invention on the road.
You can watch Colin build the wheel and explain the process in detail in the video down below. You can also watch him ride his Franken-bike around and have a blast.