A professional who lays out lines of ship to full scale on mold-loft floor and constructs templates and molds to be used as patterns and guides for layout and fabrication of various structural parts of ships. Responsibilities include:

• Lays out full-scale portions of ship's plan, working from blueprints and tables of offsets.
• Marks frame lines and other reference lines on loft floor with marking instrument.
• Measures dimensions between lines and prepares table of offsets.
• Compares prepared tables with tables on blueprints.
• Constructs template, using knowledge of geometric construction, and handtools and woodworking machines, such as crosscut, rip, and bandsaws.
• Marks templates with identifying data and instructions, such as number of pieces to be made, type, and weight of stock, and location for installation.
• Constructs full scale wood mockups of ship's parts and sections for use as guide in shaping or positioning parts.
• May construct wooden plug mold parts, such as hulls, decks, and cabins of fiberglass boats, and be designated plug builder.