Clamped the backing strips to the side of the cabin cover. Trimmed to accomodate a couple of bulges. Matchdrilled all the holes #30 on both sides.
Dimpled all the holes on the skins (top forward skin, mid side skins).
Deburred all the holes (marco Biagi), Countersunk the cabin cover #30 holes for the CS4-4 pop rivets.