I know it's a joke, but I wonder if there's a market for a smaller version for mechanics working under cars? If the movies are to be believed, most car repair work requires lying under the car.
I don't think this would be a successful product in that space. Professional and many dedicated amateur mechanics have lifts, they're not lying on their backs. Even if they were, space is at a premium and this is a really fun and goofy solution in search of a problem.