Build 7: Join the screen to the leading edge of the sail

Place the sail face up, and the screen on top as shown in the left most drawing.  Sew a straight stitch along the whole top of the sail.  Be careful to sew along the line so that the sail is even along the full leading edge.  Once sew you can remove the tape as it will be perforated by the needle. 

You can now double fold and sew the excess material as shown in the center diagram.  However, if you want it to look neater you can include the vertical strips in the same sticking.  If you wish to do this you must wait until after step 9 where you sew the leading edge onto the screen as indicated by the right most diagram.