I've ordered all of the parts needed for the NAGBoxes now, and am just waiting for them to arrive. In the meantime, I've been working on some of the code that will run on the Arduino Pro Micro. It's fairly straightforward since there's not a lot going on in these things. The majority of it is just reading a button, initiating a cellular connection, sending the SMS, and signaling to the user that their request was received, or successfully sent through the use of the LEDs in the buttons. Hopefully I'll have more to report in a couple of days, after my parts have all arrived!