If you find the Gerber file for this design. You could try reverse engineer using this method.
https://www.youtube.com/watch?v=j3MgdCoAoiU
The Gerber file can be downloaded from Elektor. But that requires paid membership (Green or Gold) I am working recreating the schematics. I am almost done with amp part
https://www.youtube.com/watch?v=j3MgdCoAoiU
The Gerber file can be downloaded from Elektor. But that requires paid membership (Green or Gold) I am working recreating the schematics. I am almost done with amp part
did you get the gerber files to work ?