The slides can be found here: https://flowolf.github.io/glt18-talk.
At some point I’m planning on releasing the source code and the vector files for the Wordclock face. Have still some cleaning up to do. In the mean time: there are several word clock projects out there that use a Raspberry Pi and Python; just search for them.
Edit: the code can be found here: https://gitlab.com/flowolf/wordclock/