I've been watching a YouTube channel lately called "Insider Carpentry - Spencer Lewis". He's a young guy but a truly excellent teacher and craftsman. He's a trim / finish carpenter but works to a level that many of us aspire to. Here's a great example of his work, about miter folding plywood, that might be useful to many on this forum. No affiliation or relation with this person, btw.
https://www.youtube.com/watch?v=kOmfHS3HtqM