Another monster six hour session finished the drilling for the slats. Only a few "gotchas" were hit.
First with the trailing edge skin be careful with the holes of the ribs. The last hole for each rib intersected the skin. This normally would not be a big deal but the ribs were already riveted ( per instructions ) to the bottom half of the main skin. In two cases ( outboard skins ) there was enough edge distance to drill out the rivets and use a strap duplicator to carry the hole onto the edge skin. With my inboard skins I had to make notches for the rivet heads.
All four slat pieces are drilled to final hole sizes and are ready to be deburred, primed and riveted.