This is a significant improvement to the first version that can be found in a different repository. There is also a companion board that interfaces to the outside world with insulated signals. This is a separate project called GPSDO V4 Interface.
The BOM's are of limited value because I do not specify the actual mfg partnumbers that can be ordered. I merely specify the value and the footprint.
The Arduino Nano sketch has a number of improvements, most notably the support for obtaining the Qerr value from the NEO, the automatic TC functionality, support for a room temperature sensor and a real 16-bit DAC.
A lot of detail can be found on my Blog here: https://www.paulvdiyblogs.net/2023/06/gpsdo-version-4.html Be sure to visit that regularly to see if there are any updates.
The boards can be ordered through PCBWay, or the Gerbers can be downloaded there. I have created a Shared Project. Search for DIY GPSDO. PCBway had some questions about the parts they used for a customer that wanted a full assembly. I added comments to a document that they used to ask for my input. The Q&A documents is called "QA for BOM 10MHz GPSDO V4.2.pdf" I also included the Centroid files for both sides, they have the .pos suffix