Not a bad excersise; I liked the way you illustraited it, Phil. I have done similar angling exercises in the systems that I study.
I like the angling exercises in Bando, because they focus more on actual cutting methods with each angle more then my Filipino stuff, so it is easier to teach, giving my students a concise formula to go by.
I don't have these nicely illustraited photoed in an article, unfortunatily.