I am designing my own custom expansion PCB for the 3pi+ robot. I am adding the functionality of communication (using a XBee, specifically a XBee USB Explorer board) to these robots for my experiments.
I am a newbie when it comes to PCB design, I was hoping to get some confirmation about the drill hole sizes and spacing, and the location of the 7x2 header (which is used for connecting the LCD, I am repurposing it for the XBee) on the control board.
I am attaching all the files that I made for reference.
Eagle Project - 3PI+_XBEE_EXP.zip
Custom Libraries - custom_lib.zip
PDF to specify spacing and sizing requirements - details_needed_sizing_spacing.pdf