Today I started by deburring all of the edges on the flap skin. Next I pulled the rivets on two sides leaving a flap open for inspection prior to closing. After completing the right flap I started to layout the holes in the left flap. I matched the same mistake I made on the right side in order to ensure the two flaps look the same. After marking all the holes I drilled all the #40 pilot holes through the skin and then I started to install the ribs and complete the pilot holes into the ribs.