great modeling! :) only one thing attracted my attention: Are those two big cable glands in the front closed? Looking at your reference pic and for example at the folowing link - they must have an aperture for the cabel to go through. http://www.rst-gruppe.de/cfm/index.cfm?ident=produkte.kabelversch...

very very nice! i love the wall!

PS: maybe add a skirting board / baseboard / mopboard where the wall hit the floor.

perhaps it reflects the blue of the sky?

very nice, can you try it with some kind of muddy water and wreckages (or debris? i dont't know the right word) ...

Me thinks you talking at cross purposes.