More testing of this PCB. All looking good so far. After much measuring and testing inserted the Processor board, powered it up and the system booted up! YayPowered up the new main control PCB for a spectrometer I am designing that came in from the manufacturer recently. Working through the test plan. Power supplies came up nicely and within spec. Full load testing of one has been completed one so far, and no hot-spots or other surprises were found, as evinced by the thermal camera imaging. More power supply testing to come and then I'll fit my processor card to the board and pass it to the Firmware team for more development and testing. Adding a USB hub to the board was one of the major tasks. That is the highest risk in this control board design, IMHO.
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Now waiting for two ICs from Digikey to power up the remaining sections of the circuit.