As I have received a lot of "free stuff" on the internet myself, I want to give something back.
Therefore I provide all software, drawings and diagrams you need free of charge. You can find them on Github. Are you stuck? Do you need help? Would you like to come by and see what it looks like? Send an email and I will help you further.
February 6, 2021: first version of all documents published.
August 22, 2021: seperate "open source" part on the website