Graynomad:
Nice job by the looks of it. The PCB looks very professional.I've often thought about using the Jee stuff, are you happy with it? I gather you are using their code but your own modules.
I just use it for the RFM library, I haven't actually used any devices or any of the Ports libraries. Otherwise, the library has worked very well and I have been running the dusk-to-dawn porch light for months now (on a single coincell using their sleep code) and have had no issues.
Where does the magic ID number (0xA0000001) come from?
Where any other magic number comes from, of course, right out of thin air! 
I just have been assigning any "sensor ID" to an unsigned long number that can be recognized individually on the network.