The source SVG files and some building instructions are found at
The design evolved slightly after the prototype shown in the photos.
It still is somewhat a work in progress. I'll upload a full set of file to thingiverse, once the design is finalized.
The machine is already fully functional.
Please make sure to download all three files schickard_napier.svg, schickard_adder.svg and schickard_memory.svg all at the same time from github. Some components of the latest design are no longer compatible with versions from January 2019.