This project template is the basis of an expansion board for the BeagleBone Black
This base project includes a PCB edge defined as the same
size as the BeagleBone Black Cape refernece with the connectors placed
correctly to align the two boards.
Contours and holes can be easely modified, just remove line or hole
and redraw wath you want in layer "edge.cuts".
The final PCB looks like the following:

(c)2015 Jakub Źrebiec