My personal observations on the 5-Seat delivered yesterday.
More photos today added at my Tesla Model X 5-Seater Photo Link.
I revise my statement about strength about the cargo panels -- they are strong, and don't flex much considering my 190lbs on them. Could someone sit on these -- definitely yes. Can a person ride back there --- up to you -- yet the panels will hold the weight.
The top row placement is nearly as good as it could be --- in my opinion. If you are wondering about the gap: The gap from the 5-seater seat backs to the frontmost cargo shelf is necessary so that the 2nd row can recline. It gives the 2nd row seats all the room for a comfortable recline.
Perhaps my only disappointment is illustrated in the last couple photos, where you can see the gap between the rear panel and the actual floor is a compromise so the panels can fit together snugly when inserted into the top row placement. Note the iPhone 6S w/ case fits in the gap. And yes, that gap does go to the lower well.
In summary I can clearly see now the objective of a flat cargo space at the height of the folded 2nd row was the primary goal. And if that was the overall objective -- optimistically speaking, I think Tesla succeeded as best they could.
TechVP: thank you immensely. That rear cargo flooring photo album you provided is definitive. The parts installed in your vehicle are clearly parts that have not been been installed on any of the other vehicles we have seen on this forum, and certainly not seen on parts in my Model X. The unsettling reality of the photos you have provided is cast against my lengthy conversation I had with the manager of the Tesla Service Center in Fremont on Friday. He very clearly stated that the updated version of the 5 seat cargo flooring panels was not yet available. I don't have the heart or the stomach to give him a call back on Monday and start a flooring confrontation. But this flooring fiasco, and the alternate realities being served up by Fremont, and just plain disinformation, is so strange.
You are fortunate to be above it all. Congrats on your new car, and enjoy the smooth and streamlined cargo capacity back there in what in my car is known as "no man's land."