I made this bbi recurve recently. 2 ipé lams, wich are really thin (like 1/8") will take the bend without breaking. My lams were a little thicker, so I glued a less-severe recurve in it, and when it was finished I had sanded away almost one whole lam. 2 lams, tapering from 3/16" to 1/8" would be ideal, and with a thin boo backing it would be ready to string once it comes off the form.
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Nick