This was a labor of love, so it’s definitely not that I don’t have time - more that no project of mine has ever been this popular, so normally no one asks for the tutorial!
As others have commented, this project is mostly software and would be a great introduction to building physical electronic gadgets.
How about this - I think there’s enough context in the blog post and source code to recreate it, but if you start out and run into any issues, send me an email and I’ll get you unstuck. In exchange, I’d ask that you take detailed notes of your process and post a blog post/github readme of how you got it running for others to follow, and I’ll link to it.