View of cross section 4 after the outside stringer holes are drilled. The inwale still needs to be marked and drilled. The flat section at the top is the forward coaming location.
To accommodate the concave nature of the skin while in the water, the cross sections are cut to that shape. Between the keel and chine, the cutout is 1/2″ to 3/4″. Between the chine and gunwale, it’s 1/2″. Place a small nail half way between the stringers, and insert small sections of 3/4″ tubing in the stringer holes. Place the 3/16 ” or 1/4″ flexible tubing as shown in the photo above, and mark the curve with a permanent marker pen. These lines will serve as a guide for cutting out the cross section.
Concave Cutouts – The cross section after all concave lines are drawn.