King ClassThe folding roof (sloping ridge roof)
Das Turmdach als Faltdach
In this task model the main ground plan is developed from two rectangles rotated at 45°.
Here's the actual task model ground plan from the book.
Here's the similar geometric development to the Alhambra Granada for the roof design.
Here's the geometric develop that I've done so far. Bernd Kuppers shows all the steps to produce the following roof layout drawings.
Valley rafter development.
Plumb jack rafter claw geometric development.