Thanks for that great work to provide a clear diagram for the uBITX connections.
It highlights a point of possible confusion that will probably need to be clarified higher up the pay grades than we are :^))
Your diagram properly shows pin 1 of the 16-pin uBITX header to be not connected.
As indeed the uBITX PC board is physically made exactly that way.
But the PNG file schematics of the Raduino show pins 1 and 2 of that header connected together.
A check of a physical Raduino board confirms that connection.
And pin 2 provides the +12V line to the Raduino from the uBITX main board.
yet another But.... the PDF schematic files ubutxv3, ubitxv31, and ubitxv3-1 all show pin 1 as grounded.
No harm, no foul, as long as pin 1 remains physically "nc" on the uBITX main PCB.
But if those schematics portend a future revision which intends to ground that pin, that'll be an issue.
As an aside... if a revised main PCB were contemplated, using two adjacent pins for the +12 line would be a good idea from a reliability standpoint.