protruding wall with shed in front of Gable roof

[daydreamer]

You're welcome...

The wall being continuous as you state in post #17 doesn't have anything to do with it. If you draw it continuous and set it to Gable, then use the wall break tool and break the wall where each of the Box window wall intersect the main house wall, then select the Wall tool or the Select arrow (if you don't select the wall tool or the select arrow you will continue putting wall breaks in your wall) and double-click in the middle of the main house wall you just placed the breaks in. Under the General tab select Invisible.

I didn't do it in my model because I was lazy and it had not bearing on the outcome.

For the cathedral ceiling, open the Room Specification dialog box. Under the Structure tab, unselect "Ceiling Over this Room".