for starters, most osage bows that are about 66 inches or less can be made about 1.25" wide and the thickness will come as you get it to floor tiller. If you can post pics that might help out. You need to draw out the center line following the grain, once you have done that you can start marking out the maximum width following the grain. Any more questions? i hope some others can explain this process better, i know i could do it if i had the stave in hand, just hard to explain.