As a part of my DIY hobbies program I am glade to share my Altium based BeagleBone Black Cape template. In the repository below you will find the schematic and the PCB template for 2 and 4 layers. To make sure I’ve added also a 3D BBB on the PCB to ensure your design does not touch the BBB.
P.S. You will found also other freebies and goodies in the repo.11