Making sure it is square and fair.

After mounting the transom and Bulkhead "C", we drew perpendicular lines from the top of the bulkhead and transom to the point of the chine on each. We then attached a couple of straight wood pieces along the lines on the bulkhead and transom and measured up about 30 inches from the deck line so the string would be above the keel. We attached a string diagonally across the boat allowing us to check rocker and be sure the diagonals measured the same.