Hello,
Even though building a radio is superb, I think the Aussies beat us to it w/ their take on SDR. Let me see if I can scrounge together the artifacts and currents.
...
https://www.seeedstudio.com/KiwiSDR-Board-p-2723.html was the info. gathered years back but...
1. They still produce.
2. They have a github repo. for advancement also...
Seth