I've never attempted or made a board bow.
I wouldn't even know where to start.
I started properly by screwing up a beautiful 68" prime osage stave that I'd aged 10 years. I still have it and I'm not done yet but that 68"s turned into what is going to be a 58" flipped tip take down bow. Never ever start with a nice stave to make a sleeve take down on your first attempt.
I will get'r'done because I'm soooo sloooow and patient.