Steve,
I've been watching YouTube videos on Japanese methods for the complicated joints they make, mainly to pick up what I can on perfection in woodworking. Seems now I should have been watching you. The methods you are using are extremely accurate, with little room for error. Kudos to you sir, this project is a course in perfection. 👍👍

Also, Merry Christmas and a Happy New Year to you and everyone else here on this site.