I have modeled a first draft of the case to hold my electronics. This is for an initial prototype. It has 3 main sections.
The first section is to hold an arduino in place, also allowing the usb and power things to extend out of the case. The second section is to house the large quantity of wires that will be inside the case, finally, the third section is for a breadboard so that I can nicely handle all of the electronics with minimal soldering.
The lid is built to slide into the top of the case and allow wires and devices to come out of the box.
Once 3D printed, adding some magnets should allow this to be mounted to most fridges.