Hi Darrell
This looks like an interesting solution to the problem of linking the two boards.
But note that the cables need to be very short in order to reduce noise, the ones you linked to are 300mm, just under 12” to those of us still using imperial units and I’m fairly sure that they would be too long. The Amazon seller lists a similar set of cables that are 100mm that might be better but from what I remember from the original build discussion that may still be a bit “iffy”. Need to find the reference in the original thread, a quick effort to search didn’t locate what I was looking for, I’ll try and find time over the next couple of days to do a more thorough search.
Best
John