Inspired by this, I eventually got round to making a smaller gateway:
[image: 35kk68m.jpg]
[image: 2n7l0f6.jpg]
I'm powering this from a 5V USB source, with an AM1117 3.3V regulator for the radio.
I also took the opportunity to use the MySensors 2.0.0 Serial Gateway example, and to convert my existing sketches - I followed this thread.
