We run some 280x and some 380. It's been running there and almost forgot about, we are deploying hundreds of S7's at our new location.
Will try to update pics someday.
We use EVGA 1300w with some adaptors we had made custom (to add more pci-e connectors).
Everything runs on 240v with tripplite PDU's.
The plates used for mounting motherboards are from http://caselabs.net/, Model is Mercury S8 (tray only) which can be found here: http://www.caselabs-store.com/atx-motherboard-trays-pricing-varies/ (15$ USD a piece with mounting studs and screws)