So here's thing. If P2 is populated with a 3-pin male header as rendered in your drawing, I think you are forced to then solder it to the DCSRC board. If a 3-pin female socket is placed on the DCSRC board, the combination of the header and the components on the daughter board will be too tall. That is why on my implementation there is a female socket on the daughter board; the 3-pin socket is installed on the component-side and soldered on the solder-side like all the other parts. Does this make any sense whatsoever?
I figure there is a benefit to being able to remove the daughter card by simply pulling it off (rather than de-soldering it) to revert to the original DCSRC.
