We already had some discussion about the MicroMod standard that might be useful, obviously this is from the POV of using a Microcontroller FPGA combination (like Alloy) but it may be of interest because it covers some useful issues with that particular M.2 connector re-purposing https://forum.mystorm.uk/t/re-using-m-2-connectors-micromod-and-blackedge-alloy/866/6
We already had some discussion about the MicroMod standard that might be useful, obviously this is from the POV of using a Microcontroller FPGA combination (like Alloy) but it may be of interest because it covers some useful issues with that particular M.2 connector re-purposing https://forum.mystorm.uk/t/re-using-m-2-connectors-micromod-and-blackedge-alloy/866/6