I made a pyramid from flooring backed with bamboo. It was 66" n/n, started at 1.5" width and tapered uniformly to 1/2", so it was only 1" at mid-limb. I made the mistake of getting a really nice bend at nearly 70lb@28" and chose to stop. Too much stress on the bow as it turns out, a limb snapped. The design would work well at 50lb@28".