Saw this article on BoingBoing about a recreation of a vintage mechanical computer toy:
I clicked through, and discovered it was made at https://www.kwartzlab.ca !
Using the attached “cut” files, create one Main Board and six Switch Tops. I used 1/8 inch (3 mm) hardboard which I laser cut at my local maker space (check out the awesome Kwartslab). I haven’t tried it, but you should be able to mill these pieces as well. I would not recommend trying to manually produce them as the precision required for the switches to work reliably is quite high.