I think you are looking for a glass bow. The shortest you could go with a stiff handle and 30 inch draw is probably around 66 inches for a selfbow, and that is REALLY pushing the limits.Ive seen some 54 inch stiff handled osage bows that draw 26 inches but it is pushing the wood to its max. I would make a 72 inch selfbow to start and then work your way down to around 68 inches for a stiff handled bow with a shelf. for a bendy handle selfbow you could push it all the way down to around 60 inches or maybe a bit less if your really good. But to get a 30 inch draw at 66 inches for a stiff handled and 60 inches for a bendy, your tiller would need to be PERFECT. For a sinew backed bow you might could get down to the 50 inch range, but again, the tiller would have to be perfect. As for the staves sitting in your drying box, Dogwood is a very good, hard wood, it makes excellent bows. Maple, however is a bit on the soft side, unless its Vine Maple I would be cautious, Red Maple is a good bow wood as well but any other maple and you might need some special design considerations. Oak is a good bow wood in general, do you know what species the Oak and Maple are? That could help us give you some designs.