Look underneath the flap in figure 20. There is a straight edged pocket that forms the bottom of a triangle. Pull it out and over the flap to look like figure 21. Using the crease in the middle of the triangle, pull up the crease with a mountain fold to line up with the side of the triangle. It will form a flap as in figure 22. This is done like in figure 19. Notice the two flaps at the bottom.
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21
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23
In figure 22, above, there is a mountain fold vertically in the middle fold it behind as in figure 23. Flip the figure sending the front to the back and the back to the front.
In figures 24 to 29 fold the model like the figures 15 to 23.
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25
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27
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29
Notice that the figure is shortened at this point.