Check out this beautiful DIY steno machine, the Tiny Steno Board 2, by community member SashaK!
Sasha writes:
The idea was stolen from Charley, the internals - from OLKB/Planck project. I stumbled upon an old mechanical machine, so had a chance to compare the Stenograph keyboard feelings you mentioned in some articles with the computer switches. I measured the size of keys and tried to re-created their form. The link to the project is in the Thingiverse article, it is rather primitive - holes laid out, the case is built around them to fit the switches. The controller fits nicely in the empty space under the right palm. Case is connected with stand-offs and screws from both top and down parts.
Component prices (approximate) - one ProMicro chip (10CAD), 23 Matias switches (10CAD), 2xUSB connectors (10CAD), 23 diodes (2CAD), USB cable (5CAD), screws and stand-offs (say 3CAD). PLA plastic - 200 grams, about 5CAD. Some wire, and old micro-USB cable to connect the chip to USB connector. 50CAD in total.
What a beautiful little piece of work! Go read more about it on Thingiverse, or use the detailed schematics there to build your own!