I take your point; soldering individual boards scales badly (although the pitch for the USB+power contact points only looks a little worse than for the GPIO pin

I take your point; soldering individual boards scales badly (although the pitch for the USB+power contact points only looks a little worse than for the GPIO pins: http://hackaday.com/2015/11/28/first-raspberry-pi-zero-hack-piggy-back-wifi/ http://hackaday.com/2015/11/28/first-raspberry-pi-zero-hack-... ).