I've made several black cherry bows... all backed with hickory, maple, or rawhide. All have been 64"-66", with 1 1/2"- 1 3/4" wide limbs for 2/3s, and tapering to 1/2" tips. Keep cherry wide and long, or it will probably fret or break, and take excessive set. I think you're asking a lot out of a 53" branch stave. But, that being said, give it a go, and see what happens. Sounds like a good learning experience to me.