Thanks! Actually, its not 100% off topic as the circuit board for this machine is multifunctional and, thanks to @Zack, can (hopefully) be used to control a LimeSDR. I took your advice and put a load of sliders on it:
It can accept a 3V Arduino Due which will communicate with the LimeSDR via SPI. Hopefully it will be a standalone solution for the Lime although I've as yet no idea how to Rx / Tx audio, although the Due's ADCs might come in useful? Board Gerbers have been sent to China for manufacturing and should be in my greasy paws in about 10 days time.