Since I'm a total freak I had to go have a peekypoo for myself.
I'm going to go on a limb and say all these panels still needs to be aligned lol. I figure they get hung on a cam or slot type of rail and then get put into place after the fact. Makes sense to me. Hang all the pieces and then align them.
That being said the material looks like a dogs breakfast. From the sidewalk it seems to resemble Trex decking material but in a slab format. It... um.. sucks. Honestly.
I guess we will wait and see.