Crab drive question

[Jeff K.]

You can probably pull it off using the EDU kit. It would just be really complicated and also A LOT of the little plastic chain. You can make a little rotating platform for all of the four wheels and then from there, have their rotating be controlled by one motor that is connected to all of them by chain, and then on the rotating platform....wait...nevermind.
I just realized that it would be overly complicated and it is late...
But maybe you can instead use three servos for drive, one on each wheel to drive and then one to control the rotation of it, but instead of having to use three channels, you can use a y-cable for the PWM cables so they both are on the same channel.

Well...that's my two cents.
That projects sounds really cool. Good luck and I am interested in seeing some pictures on the finished product.