I have finished the guide on how to make the Pi Zero W datalogger, you can find it here. Let me know if you have any questions.
I will upload the custom image once I manage to shrink it down.
AGU2017 MacGyver poster
Thanks everyone for the amount of interest today. Don’t hesitate to ask me questions by mail! The Instructables page and SDcard images will be showing up here in the coming weeks.
Update: the Instructable can be found here