I just notice using a XBee Pro might be a problem with the adapter. It appears that the module will hit the top of the capacitor and possibly the regulator because it's longer by 5.3mm than the non-pro version. I don't have the adapter myself, so I don't know if bending the components over when mounting them will create enough clearance? I am basing this off of this one photo:
Also, I noticed that the schematic doesn't open properly in Eagle(v5.4.0) because it's inconsistent with the board. I am thinking of making some mods and enlarging the board to make room for a TO-220 regulator.