OK here we go…….
I start preparing the ribs of the elevator. At a spacing of 4″ I drill a 1/8″ hole for the rivets that are going to hold down the fabric, as its only glued on the perimeter only.
I decided to drill before the fabric goes on so there is no swarf left inside the panel. I am going to use rivets with a thin small aluminium washer, so the spacing of the holes isn’t critical, but it will look “good” if they are in a nice line and equally spaced as they are visible once its all finished.