Drilled bottom and side skins common to frame members but not F-1006. Debur top skins, F-1074, F-1075 then put in place. Had problems with fluting the tabs with two punched holes. The F-1075 is a very tight fitting skin and required lots of work to get into place. F-1074 went directly into place with out much fuss. I will need to re-work the F-1075 tabs before priming the piece.