Blue Series 12A ESC schematic drawing (or layout)

Hi, all.
These days, I plan to DIY a drone. In the drone, I want to make a PCB which integrated control unit, ESC, Gyro, barometer, and etc. Specially, I want to use blue series 12A ESC as that on my drone. As all of us know taht the blue series 12A ESC can be flashed by BLHeli by myself. However, it is difficult to find the schematic drawing(Eagle file, althium file, or PCB layout) of the ESC.

So, could anyone give some help about this? Thanks in advance.