You have a very cute quilt there. Just a few ?s and thoughts. I like gingham used on the bias. it takes a lot of starch and pressing the fabric rather than ironing it so as not to distort it and looks great that way.
Now, if you had put the sashing on the B would you also have put the border and binding on the bias too? In my eye that would keep the quilt consistent.
As you did it, it is perfect. Not that gingham has to run in the same direction but on this little charmer, it works perfectly.
peace