James, I was impressed with the writeup you provided, very detailed and very explanatory, but then I came to the end and saw the painting you made & I was blown away. You truly are a talented artisan in both wood and canvas. What else do you have up your sleeve?
The method you use to create the corners - using adjacent wood from the same board for grain continuity - is similar to what I do when I need inch and a half material. I make legs by cutting the components out side by side, then book match the two. Works pretty good.
Anyway, very nice looking mirror.