When the F-01479 aft skin is installed, be sure to place the top-most tabs of the F-01412a bulkhead inside of the F-01418B L and R longerons, i.e., the longerons fit between the bulkhead tab and the skin. If you miss this, the aft-most three predrilled holes in the longerons and the F-01414 aft deck will not line up. Ask me how I know . . . Doh! I have sent a note to Van's suggesting they place a note on page 10-17 to this effect. There is already a note stating to place the F-01479 skin between the F-01410 bulkhead and the F-01478 bottom skin. I have also asked for a recommended repair, as I have already installed the left and right skins.