Success... I've got the CumulusMX software up and running on the RasPi3, and connected to the WeatherDuinoPro2 RX station. I'm using the built-in wireless adapter on the Pi3. Stats and data is coming through on the USB, and I've had the Cumulus website (on the Pi) open in a browser on one of my PCs for a couple of hrs now, and all good so far, and no lock ups. (Note that I don't have the solar sensors connected at this point in time, so those figures will look a little skewed (read: High) in the screenshot) I've been making heaps of notes and I'll do up a quick "how to" guide sometime soon.
Mark R
{click photo to enlarge}
Mark R
{click photo to enlarge}