Rings look good to me. I prefer thin rings over thick. Get a good pristine ring run on the back and you won't need sinew. Add it if you want to but not as a patch for a suspect back, and that shouldn't be to hard with this one. 63" long. 1 3/8" to 1 1/2" at the fades to mid limb and taper it to little bitty tips. 4" handle 2" fades. That's what I would start with. Good luck with it!