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You really don't even need 4 wheel drive for a productive robot. Last year my team had Sparky running a rear wheel verticle mounted drive system, using the drill motors, that could easly push around another bot. A crab drive in my opinion isn't as productive overall as a old fashond fixed wheel drive system, just too much stuff to go wrong. If you have something that's innovative yet simple, you are likely to do well with your dive system.
Ivey
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When you tell a student not to do it, you shouldn't do it. Or else you will wind up with a 3/8" drill bit in your finger... Like I did...
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