>>3763686The code is literally compiled and ready to go somewhere.
instructables.com/Build-a-Camera-Shutter-Speed-Timer/>>3763734If it's like the yashicas you take the leather off the front to get to the shutter/lenses, and you just unscrew some tiny screws under the fold-up chimney for access to the mirror.
Also, inspired by the other anon I've continued work on my instax back. Here's the current skeletal sandwich.