This task model still needs a lot of work. However, it was a lot of work just to draw the 3D model. So I could check the geometric lines of my drawing. There's a lot going on to draw out the Valley Sprocket Rafter. I haven't even gotten to the claws on the jack rafters, but that shouldn't be hard to draw.
The new book on the ancient knowledge Roof Framing by Bernd Küppers