Centred on Edge computing, Seeedstudio hopes that the re_computer will provide better access for people looking to get into single-board computers. The service allows people to assemble custom-built devices that should suit a wide range of use cases.
https://www.notebookcheck.net/Seeedstudio-launches-the-re_computer-an-SBC-customisation-service.458954.0.html
I will start with an IO module that has a 12 bit, 120Msps ADC, then take the SBC that can handle it.
Since no such IO board exists, I suspect none of the SBCs could handle data at that rate. Which kills of my idea before I even consider DSP, let alone a DAC output module.