Right. It's all coming back to me now. When we built the replica of Buzz Holmstrom's Julius back in 2001 (below), the strakes were not straight either. Because the angles of the side get increasingly vertical as you move up the hull. So I learned to spile, which is the way you determine the curve of each successive strake using a long straight batten board and a compass. Another pretty simple technique, which I honestly did learn. But it fell out of my brain, and was not necessary on the last boat I built.