Decide to publish the schematics for this. It is my original work and I was asked to share it with someone on the ArduPilot team which I did, but now not too sure that was a good idea since communication seems to have gone dead
Kicad version
https://github.com/kwikius/ardupilot/tree/master/Hardware/aerflite_fc_osd_v1.0
pdf of the schematic
https://github.com/kwikius/ardupilot/raw/master/Hardware/aerflite_fc_osd_v1.0/osd.pdf
Also a pcb available on OSHPark
https://www.oshpark.com/shared_projects/y3W1hwwK
(I would advise though that you will seriously struggle to make this board by hand)
I hope that if anyone on the ArduPilot team does decide to make use of this work that they will provide due acknowledgement of my authorship, and of the informal info I have provided in “chats” etc.
Andy Little