Trumpy:
It looks to me like what you are seeing as going into the vent on the left of the first picture is actually one of the struts holding up the barbed wire around the top of the wall. Look at the 3rd picture and you can see the bottom edge of that vent.
As for the drain pipe ... I wouldn't want to be climbing up on top there myself. The space is covered with some kind of wire grill as seen in pic 3, but it doesn't really look strong enough to stand on.
Based on picture 3, it appears the wooden pole comes down in to the left of the entrance door. So that distance would be part of the separation from the roof. But it does look like it might not meet the 10 foot rule. The exact distance of the pole is not obvious from these pictures. A wide view facing the door side from further back would have helped for that.
And I'm concerned about oil cooled transformers so close to the window above them.
