Raven , i scrape the bark off with my knife held at 90 degree angle and that is the back , on this one it is a bend through the handle so the center is parallel and then a slow taper to the tips . seems easier to keep the center stiff that way.all too often a bend through the handle bow looks like a hinge in the handle bow. also the thickness tapers some ,unlike a true pyramid
thank you Eric , you may be right
thanks Gus