Very nice.  I had picked up a few empty 4u cases to try to modify them to hold ant s1's, but i have to say - this looks so much nicer than what I was trying to rig together.

The PSU case is awesome - i was trying to figure out how to manage the psu's on the rack.  One really cool improvement would be if you could get an extension cable that went from the output of the power supply to the case where the ants where.  then mount the break out board in that case.  then the PCI-e cable mess would be enclosed in the ant miner case.