I put some photos with details of my Rug Warrior Pro / Raspberry Pi / Pi Droid Alpha based robot. I built the Rug Warrior Pro robot kit in 2000, and last year decided to upgrade the "brain" to the Raspberry Pi B+ and chose the Pi Droid Alpha for its single card interface to "everything a robot could want." in a form factor that fit inside the existing skirt of my robot.
Pigo - Rug Warrior Pi Robot Photo Album:
https://www.flickr.com/photos/85977298@N07/sets/72157670632657716/