After the standard preparations (deburring, cleaning and anticorrosion protection) the frame work was riveted as described in the text and clearly shown in the pictures of the manual. No big deal but the attachment of the rudder tail skin took some time and a few broken nails before it could be squeezed and clecoed into place between the two side skins. I have to await the inspection of the frame before riveting the skins permanently and also have to await the riveting of the trim plate (solid rivets).