The Catfish Bitcoin Mining Shelf Rig Mk II - nearly complete:
http://www.catfsh.com/bitcoin/shelf-rig-mk2/11-nearly-complete-1.jpgRemaining things to do - remove CD-ROM (was only there for installing Linux on the three boards), screw in another wooden support for the hard drives, secure the PSUs where they currently sit (under the temporary boarding that the HDs sit on), and add two front doors - open mesh (like a rabbit hutch) or perspex frame with a single row of PC case fans horizontally down the centre, to blow air *onto* the top of the GPUs.
The aim is to get a furniture-like modular piece that can be moved anywhere and vents the majority of the hot air upwards, where it could be collected in an airbox and extracted using an extractor fan (or used to heat the house).
This one is consuming 2000W at the wall and is running really cool for air - haven't started overclocking in earnest yet but there's loads of headroom to come. I've finally come to a design I'm satisfied with, and will be rebuilding my Mk I Shelf Rig into the same design (I've got another two boards and 12 cards to use)...
