The temperature is not bad.  The hottest I have seen the GPUs get up to is 84c.  There is no noise what-so-ever.  I ran the power through the ceiling and plugged it into a storage closet across the building.  The only problem that I am having right now is that one of the cards seems to have gone out and I can't fix it without taking it down.  Also, the ceiling looks like it might cave in at some point.  I'm having a difficult time finding opportunities to work on this thing without anyone noticing.