The beak is 180 mm wide, the length is up to you. Round the beak off with a nice circle. The foot is entirely up to you, but don't make the line F-G less than 100 mm, it will be too hard to sew. F-G on the side template where you think the foot should be, see figure 2 . Now all the templates are finished and you should have ended up with something looking like figure 1 .
All templates have seam allowance included.
If you think this sounds impossible when reading through the instruction take a deep breath and try. I promise that it is more complicated to explain than to do. Cut out one side and leave it on the template. Cut one more side and notice that the two sides are welded together which will come in handy in a moment. If the fabric is not too dark you should be able to see through it.