This board was designed in 2018 and also used for some of my other other projects. It has been manufactured , tested (duh, what can go wrong on a plain backplane board).
( Well to be honest, in the first series the mounting holes for the connectors were not 100% aligned but using M2.5 screws this was not a real issue).
The board as it appears in Kicad (Non-Rendered and Rendered versions) :
