UAEFI revB won't actually plug into a standard 2.54 breadboard via the vias added inside the molex space.

there are a few spots that align, but that's probably just a coincidence:

the idea is that every interface with a potential carrier board be placed on a 2.54mm grid. even if it's on the other side of the board, such that uaefi can be made to fit on a completely generic dual-sided throughhole prototype board