(Note that i'm going by what our roof truss manufacturer and engineer puts back to us - I just draw the things )
Most hipped roofs I see are more like a half-truss that has a "follow me" running around the perimeter rather than a trimmed shape as you show, so the following might not be of any use...
The common detail I see is that the hip timbers always meets at the top of a rafter and this position dictates the rafter spacing. I always see this rafter doubled up too.
Most of the time it does; aesthetically it looks nicer, but there are occasions where it has to change. (Such as matching an existing roof pitch or over-shadowing.)