[marshmello]

We are using a custom chassis, basically two boxes assembled from 1/8 aluminum with a lexan belly pan in between, reinforced with 1x2 tubing and churros. We have a lot of stock metal, plastic, and wood on hand, and access to a professional metalworking facility.

Also, all of our wheels touch the ground at once, we're using belts and 3d printed pulleys, and we have a 10.71:1 gear ratio.