Notice in the first image the missing wall between the two roof planes.
There are no internal walls, or, no walls that extend to the ground (see image 2).
I've built this structure two ways, first with a short, Open Below second floor, and second by increasing the ceiling height on the middle section.
The second floor version worked, and I was able to shorten the automatically generated walls so they only filled the gap between the two roofs, but this did not seem very clean.
Just raising the ceiling made the most sense, but but the walls are a problem -- either invisible or not. I solved this by changing them to a pony wall where the lower part is invisible and the top is a normal exterior wall sized to fill the gap. There are also a few issues on an interior view. Missing wall finish where the invisible wall butts the exterior wall for example.
So my question, is there a better way.
-- Eric