I've built a few Gyrocars with different designs. For one of them, I used foamcore board instead of plywood, which I covered with colored foil wrapping paper. I also covered the battery pack with a hemispherical spray-can lid, all of which gave the Gyrocar a flying-saucer look. I'd love to see your designs.
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Gyroscopes: Everything You Need to Know
This project first appeared in MAKE Volume 23, page 84.