As with any ship build, weather card or wood. One must study and determine the ships hull lines. This serves many purposes, but most of all...alignment of keel to frames. This insurers a straight and squared hull. So using what is visible and provided by Shipyard...LWL is marked and preparing to mark frame
alignment marks. Using a flat steel square w/steel straight edge. All marking is done using a 0.3mm lead pencil. LWL means Lower Water Line.
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