Can I buy just the parts I need?
I have a 3D printer, a Raspberry Pi, Pi Camera, and tons of servo's already. Is it possible to buy just the other parts (i.e. the Rapiro servo controller board, whatever else is needed)?
The only thing you need is the arduino compatible board ( http://international.switch-science.com/catalog/1632/ ) and screws.
The optional proximity sensor is here: http://international.switch-science.com/catalog/40/
Information on getting the sensor working is here: http://www.rapiro.com/mounting-distance-sensor-on-rapiro/
I think you want to buy servo motors, because the servos are customized for Rapiro.
Parts are available here.
All parts will be listed here but not all of them yet so far.