Things have been slow and I've been busy...
I've got all the insulation sealing, adapters, and fans mounted to the radiators. I've mounted one of the 480s and two 560s in the case and tested running all the fans at 5v. I'm rather pleased as I was unable to hear the 24 fans at all until I put my ear right next to them and even then it was just a feint sliding sound. Even at 5v, these fans really move quite a bit of air, so much so that I am going to come up with a way to stagger their off-state instead of turning them all on at the same time when water temp goes up in an effort to mitigate unnecessary dust build-up.
I will be modifying my water flow design soon, though I am still considering a number of different possibilities for the changes. I am considering a system much like tractor hydraulics where I could have multiple In and Out QDCs, but will work fine if only one is connected. This way, for a simple 1CPU + 2GPU tech station, I would only need one flow IO, but if I were to upgrade to a multi-CPU or quad-SLI setup in the future, I could simply attach separate CPU and GPU QDCs and have fresh water going to each.
I'm very pleased with my GPU mounts, but not CPU. Both of my GPUs idle at ambient temp (usually around 21C-24C). The CPU cores idle between 26C and 38C, most at about 32C when the water/GPUs are at 22C. I'll try one or two more remounts to try to bring that down some.
I've decided to just keep my existing X-Fi sound card for now. The new ZxR has better DACs, but the processor is almost 10 times slower than the X-Fi. The eventuality will be to use a much better external DAC.