Have been making good progress on the bring-up, with many of the subsections tested. So far have the hardware almost 100% 'spot checked' for no-smoke and some level of function. Am now working through integration of hardware and software, and doing more detailed sub-section testing.
Here is a photo of the 1st board:
Notice I am using a Uno development board to provide DC power as well as communication to and from the regulator. All those Tombstone resistors provide handy test points!