How do I model a Saltbox Roof (Asymmetric gable)?

Hi folks, I'm preparing a model of an existing house which will have an addition added to and it has a saltbox style roof (asymmetric gable). I've attached some images of a building section, roof plan and elevation for reference. The second floor steps back and is about half the width of the main floor, resulting in a roof that spans from the top of the wall at the second floor to the top of the wall at the first floor, forming a double height volume resulting in the asymmetric gable

I'm not sure of the best way, but this can be achieved using Clip Object to shape the roof. Trace the roof plan, roof lines and footprint. Basically construct the main roof with the differing bearing heights first as an imaginary roof that extends beyond the cut plane such that your ridge lands in the correct place. Set your gables on this roof. Next, use rectangles to clip the roof on the east side to the desired eave location. You now have a roof as depicted in y