I created an account to show you guys this:
My donor Boombox
The port extensions to the back of the case.
Attaching new “line in” wires to where the output of the cassette deck’s preamp was.
The raspberry PI installed in the case.
To the left is a mains-to-usb power adapter soldered onto the existing powersupply.
Anything luminous orange you can see is courtesy of my 3D printer.
And I have been playing music all day from it flawlessly