Two quick notes:
First, to add to my argument that the backside of the Battle Escape queue building will be themed for guest use, here's a screenshot from a recent FreshBaked video:
View attachment 277052
I've highlighted the steel that would not be seen from anywhere else but the backside. You can see that most of it actually hangs down off the framing and well above the building's roof. Again, to me, this looks like it will have some sort of rockwork applied to it.
Second, as impressive as the mountain range already is on both coasts, the largest peak on the Battle Escape side still has yet to be installed. You can see it on this model pic from the OC Register:
View attachment 277054