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These are the Hull drill locator dimples. You used them earlier to center the Hull Liner into the Hull from the inside.
Practice drilling through a scrap of this plastic with a step drill. Use a slow speed setting. Be patient. Use little pressure.
Note the drill diameter markings on the step drill. Locate the 1/4-inch mark for the Keel holes.
Use a Sharpie marker to plainly mark the 1/4-inch part of the drill. Drill the two dimples to 1/4-inch diameter. Turn the Hull
over and set the Keel Mount Shoe into the hull with the partial-hole (arrow) on the bow end.
Use a pencil to mark a line around the Shoe. Sand the area where the Keel Mount Shoe will contact the Hull and sand the
bottom of the Shoe. Flip over the Hull and note the Rudder Mount Drill Locator Dimple near the Transom.
Clean off old Sharpie markings with alcohol. Locate the 3/16-inch point on the drill and mark that section plainly with the
Sharpie marker. Drill the Rudder hole to a 3/16-inch diameter. By hand, you can use the step drill to deburr the hole on the
inside.