I am currently doing a project using Arduino 101, and I am trying to build up a PCB for a SPI master I have to connect and talk to arduino. My current thought is to design a same dimension PCB as the Arduino 101, and use pin headers for the I/O ports, but I can't find the footprint of Arduino board, so I have no clue how I can lay out the PCB and components.
I know they offered CAD files but I'm not sure how I can open then. Is there any documents for the dimension/footprint for this board?