I thought that I'd give a bit of an update. Everything is up and running at this point. Although, I'll admit that it wasn't really as easy as I expected. The big issue with my little shelf is that it goes right over top of where the ports are on my 240mm radiator, which meant it was
that much more fun to deal with those fittings/adapters.

I think I'm going to cringe whenever I see my 480mm radiator again, as I know I bumped into the fins a few times with my hand! Those things are like fragile little flowers. :|
I had some slight issues when I tried to get it working at first. During the first fill, the 480mm's inlet was leaking for some reason. I got that cleaned up, and decided to swap the fittings used on that tubing run. Well, I thought I had it on... until I saw that the 240mm's outlet was leaking!

I realized that was because I simply had a lot of trouble tightening the 90-degree swivel adapter that I had to use there, and my makeshift shelf wasn't helping either. The only way I could easily fix that was to swap back to the Monsoon fitting, which worked fine. After that, things were
mostly fine (more on that in a second). The best part about this swap is the seriously large reduction in tubing. I had one run (480mm to GPU) in my previous setup that had to be close to
two feet long! 
In my current setup, I think the longest run (GPU to 360mm) is maybe 6-8 inches.
Unfortunately, I do still have one issue that I can't seem to figure out. I use two Swiftech MCP655-PWM pumps, and as you'd expect, you're supposed to plug them into a PWM header. However, if I plug them into my Maximus VI Formula's CPU-FAN header, the pumps turn off. Yes, they don't just slow down or something,
they shut off completely, and it doesn't matter if the computer is on or not. Fortunately, if the pumps aren't connected to a PWM header, they just run at 30% power, which is good enough for me.
I took a bunch of photos of the build that I'll post later today.
So, as smack said, you're never done, and I'm already thinking about what I'd like to do
at some point in the future (i.e. not soon). My biggest problem is pretty much where to put the pump. My shelf solution is okay, but as I mentioned above, it has some drawbacks. Some possible solutions to this would be removing the 240mm radiator and dropping the pump straight down to the case's floor. If I want to alleviate the reduction in performance, I could upgrade the top radiator to a 480mm. In that case, I would just lose 120mm of radiator space. Another possible solution would be to go back to a bay reservoir, and I would pretty much have to use the dual-pump Koolance model. The one thing that would keep me from going back to a bay reservoir is that they tend to cause rather long tubing runs. The only way that I could probably alleviate that would be with a split-radiator, but those have worse performance.