I could not find them so am attaching the eagle layouts/Footprints and board files for a custom board i did for my Only5 robot.
This should allow you to do more with your board like servo control , xbee communication , encoders interfacing ( have tested all of them ) and allows you build a general purpose high performance robot capable of dead reckoning,swarm behavior,wireless control etc.
I have tried to maintain comparability with Pololu AVR libraries … If anyone finds any problems do let me know.
The connector selection is based on capability of Baby Orangutan B-328 , and a 1A 5V rail is provided for servo and sensors interface.
The board is single sided for easy DIY PCB fabrication and is all DIP.