My gracious “beta” customers returned their units, and I provided them updated devices with the “final” form factor.
This allowed me the opportunity to take a picture of the “beta” version of the CD-changer emulator unit.
You can see that the fiber-optic connector is a separate board. Initially, I designed it like that because I was planning to have a version for Jaguar cars as well as Mercedes-Benz cars. The only difference between them being the optical connector. It did tun that the Benz people are far less enthusiastic about the product, so I simplified the “final” board with the connector onboard.
In this version, the Raspberry Pi was on the side of the control board, and there is a whole lot of wires going around.
The final version was much more compact and easy to make.