Thanks for your plethora of pertinent pictures Bob! Now, for my dumb observation... we have been looking at them for weeks now, but it just hit me that these are the first steel framed construction walls I have seen/noticed. They have been made of two by fours and plywood for decades, but here they are as steel and what appears to be some composite covering.
All of the WWoHP walls were wood... so this is a kind of 'V8' new approach. (not sure that the younger here will get my reference)