I afford myself to answer in place of Aiello, as this PCB is the help I was talking about.
So I designed it a few years ago (see my post : My high-end streamer), and Aiello contacted me a few months ago to get help in this.
In fact, this PCB is here mainly to help on the overall assembly. No huge electronic on it, it’s just here to avoid many wire between the different board I decided to integrate, and make something (almost) clean.