21.) Success

The photo below shows how the bottom of the boat now conforms to the cradle (and therefore its original designed shape).  The reason it doesn't look perfectly snug is that I beveled the face of each frame piece so that only the very center of each one would touch the boat at the station line described in the plans. (Without the bevels the curved shape of the hull would cause the hull to touch the cradle at the wrong place and throw off the shape.)  The bottom photo is a top-down view showing how the frames pieces are beveled, each one depending on its position in the cradle and the curvature of the hull at that spot.  I know this is repetitive, but it's important to be clear that the hull needs to touch the cradle at the exact center of each plywood frame piece.