Strange Shack Appears in Wildcorner - SE12

 I recently went though a shoe box full of old camcorder tapes, which i thought were lost. To my absolute joy I found this grainy footage, which i thought I had taped over a while back [and berated myself many times for doing so.]
It features a mysterious looking shack, which appeared sometime in the early Summer of 2010.
It looks like it is made from a jumble of found materials and stands alone in a large sealed off piece of wasteland [a Wildcorner] on Barring Road, SE12, in the London borough of Lewisham.
What was it for? Who had made it?
 The materials possibly could have all been salvaged from within the corner.
You can see a longish narrow window facing across the wasteland and a small door at the back. A shelter made by a vagrant perhaps? Or maybe some kind of 'viewing hut' for observing the wild nature in the Corner?
 The reason the footage is so special to me is that I suspect this to be the work of the infamous city explorer Solomon Wild. The shack serving as a base to work in, while studying the corners wildlife and graff.
I used to travel past regularly on the 261 bus, who's top deck overlooks the site and I was sure I'd never seen it there before. I filmed it with my old camcorder on three separate passes of the bus.
 The shack stayed there for the rest of the Summer until one day in mid Autumn, I saw from the bus, that the shacks roof and two of its side panels were twisted and broken.
My guess is that it was caused by unusually high winds that swept through the city a few weeks previous. Over the next few months i watched it slowly deteriorate, becoming again part of the wildcorner it was possibly built from.
It looked like whoever lived in or used it, had long gone. This leads me to think the shack was only intended to be a temporary base, to use just for the Summer.
I wish now that I had got inside the corner somehow, to inspect the wreckage.