More photos:

Thanks

Thanks

It is enough help? Or remain some hidden tracks?

Can I ask one photo taken in an axis perpendicular to the PCB ?
Scan would be even better.
I need to measure the sizes of the PCB.
The scale of the photo is not important, but it is necessary to keep the angles straight.
Preferably in the bottom view.
Thank You in advance.

Almost.
I want to generate a PCB based on the scheme and check if the paths will come out in the same places.

Yes Great. Thank You
The dimensions of integrated circuits are standard.
According to them, I'm scaling the rest.

There are only ROM, UART and matching circuit to the MIDI standard (current signals and galvanic separation).

A few connections on the upper side of the board, hidden under integrated circuits.
I will have to guess ...

Which ones need to be checked?