Why not model it out of clay? Modeling clay will have some issues with the thin stuff.
Then you could scan it. Just my 2 pennies.

As to some one making the real thing. It isnt that far off from a zero turn radius drive for a landscaping mower. The question would be if you wanted it as a go cart or a actual car to be driven. Presuming this is where you were going with some of the above posts.