the zero height walls are there for a reference for the floor system and so the exterior material will cover the floor.
HI Sam
Curious, why do you set the hipped sidewalls to “0”?
I normally draw the floor system then add a roof with a heel height in this case of 14 3/4” then add the additional 2nd storey walls as a 2nd floor with the dormer walls (with roof added to those) and a separate wall at the end with a window (normally) and make that a rake wall as it won’t see the roof from below?
it’s not a lot of work but interested if your way is simpler?
Thanks GW