I started by positioning the cockpit recess (from a Petrel build ). to the Pygmy specs.over the Artic Tern plywood hull.11" height in front and 6.5" in the back ( hot glued with temporary supports). By running several battens from the bow and stern to the cockpit recess ,you will be able to mock up cardboard stations every 12". Make sure they are symetrical and cut plywood forms,hot glue the forms to the hull. Tape the edge of the hull and merrily strip away.