If I where building the bow for you I would make it 68" long, 10" handle section, 1 5/8 wide at most, 5/8 core and about a .100" thick back. I would glue in 4" of reflex so I could end up with about 1" after shoot in. This would get you up to around a 55-58# bow at most. These are just how I would do it, others may have varying opinions.