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I decided to ask AI this same question, and it appears that the response to question #1 makes sense. The response is that E+ uses the "right hand rule" which means vertices should be defined CCW from the perspective of OUTSIDE the space/zone. My polygon was defined CCW from the INSIDE perspective, so I need to reverse the coordinate order.

Having some better keywords to search for, I found some pretty vague info in the E+ documentation HERE.

I'm still not sure whether I'm supposed to add the interior ceiling surfaces as well, or if the automated addition of REVERSED surfaces is sufficient.