You can use the door described at previous point and one of the wall described in the simple room, then using various cut and pasting you can “make a hole” where the door is.
making a hole means that you have to restrict and duplicate the red wall (for instance) to be at least a 3 part structure:
The section over the door (.7x10x.2) 0,270,0
The section on the left of the door (3.5×1.5x.2) 0,270,0
The section on the right of the door (3.5×6.4x.2) 0,270,0 (You can hollow this 60 to have extra window).
You can link together the pieces of the wall but NOT the door. (UNLUCKILY)
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