I build most of my bows with osage at 58-60 inches with a non bending handle. With that noted, I strongly recommend you follow the advise given by Pat and the others. I built a dozen bows before attempting a 60". In retrospect, I believe I would have been successful building a shorter bow after the first 5 or 6 bows, but it would have been even less efficient and followed the string more then my first short one. As a bow gets shorter, the difficulty to tiller it increases exponentially. With the increased difficulty, the chance to make mistakes is amplified while the window to correct them becomes extremely small or nonexistent. Everybody's learning curve will differ, but until the basics are honed you may want to allow for the chance to make some corrections.