Once I got that done I then took a scrap of the offcut from the top to use as a guide on how low to taper the ends of the X braces. That helped me to get at least 3 of the 4 notches right. The 4th is a tad deep but I'm confident the binding will cover it. I also tapered the finger braces and lower face tone bars to be well short.
On the Number One brace I'm doing something a little nontraditional and something that Ervin Somogyi reputedly does: but the ends of the No.1 braces against the sides to promote rigidity in the area:
Again, we'll see how this works but I wanted to give it a try.