Why 54"? I don't know why everyone lately seems to want to build knee-high bows? It's entirely possible with osage, but if you have access to longer wood, you will probably be more satisfied with a longer, more stable bow- especially for hunting, when accuracy and consistancy are really important. Are you wanting a static recurve or working, flipped tips? With any serious recurves, I would bend them before tillering. I've bent recurves over my knee before, but a form works better. Also, with a osage board, I'd prefer a piece of bamboo or hickory to linen for a backing, but that's just me.