I like the steel mesh ramps on the sides. Makes sense too. They'll berth the barge, then raise or lower it to the dock height, then drive stuff right on or off of the deck. The dockside ramps are lowered in this new photo, and the waterside is still raised. They look 10-12 feet wide. You can just make out the yellow perimeter fencing along the other edges too.
I'm guessing that the fellow standing in the middle of the deck in white is operating the hexacopter that took this picture. Looking at his shadow, his hands are in close like he's got a RC transmitter in hand..
BTW, what's the big divot in the deck near the "x", a burn mark from testing? It looks like a small impact crater!