The flaps go together much like the ailerons so I won’t describe the basics here. I will note where I deviated from previous procedures.

Nose ribs go on first after the attach angles.

Another shot of using the jig boards to hold the flap spar straight and at the correct angle relative to the table top.

Straightedge and shot bags define a positive stop for the tip end of the back ribs.

The small blue dot on the bottom flap nose skin marks one of the rib centerlines. I established those marks by placing the skin on top of the skeleton structure and marking them directly to avoid measurement and transfer errors.

The top skin with accurately cut ends at 90 degrees was used to mark the centerlines on all nose skin surfaces to aid drilling.

After placing the top skin aligned with a centerline mark on the bottom skin, then mark the centerline using the top skin as a straightedge.

Here I have drilled and clecoed the nose skin to the front vertical tab of all the nose ribs. To do this I drilled holes in the skin and then positioned the marked centerline on each rib in the hole for drilling.

Marking the bottom flat area with drilling points by using a long straightedge clamped to the flap structure.

Here I have drilled and clecoed the bottom flat area, flipped the flap over, weighted the back ribs to the table with a board and shot bags, and drilled and clecoed the top of the nose skin to the nose ribs.

From here I proceeded to install the top gussets and skip drill the skin and gussets to the spar top flange and rib tops.

Everything is going well to this point....

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