This is a small Rover robot that my daughter and I designed. She's been learning to program her Arduino. This base is designed to hold 2 standard servos and uses a marble as a caster in the back. It has slots around the sides to mount sensors, bumpers, etc. I didn't add any sort of specific mount for a board though. I didn't want to limit us to a specific platform since we have Arduinos, RaspPis, and Beaglebones.

I left this as a work in progress. I need to do some additional work on the holder for the marble as it's not quite big enough to hold a standard size marble.