I am starting to build a 62" recurve. The limbs will have clear glass, a veneer of rosewood and then bamboo core, rosewood and clear glass again. We have looked at previous bows that have been built in this shop and their specs and how they came out in draw weight. I know you want to error on the heavy side so you can sand down the limbs, if needed, to bring the poundage down. Is this all just a slightly educated guessing game? With using different core woods that would effect your results too, I would think.