http://www.flickr.com/photos/39429725@N05/3626247170/

While looking at your pics. I see a portion of the ceiling (floor of the
attic) trusses peeking up thru the insulation. Hopefully its just pushed
aside by "traffic" and is actually/properly at least 10" thick. Also, I see
some exterior wall sheathing plywood where the insulation has been pulled
aside. You should consider fixing that while yer "in there".

I can't say much for the A/C "flexduct" guys installation ...Duck taped to
the studs etc.. What crap !