[x88x]

Looks awesome; I think probably one of the best thought out full-immersion designs I've ever seen (not that there are that many, but still). Depending on your budget, instead of having to put your HDDs up top with the ODDs and have to worry about cooling them, you could just go with SSDs instead and stick them in the oil as well. With the configuration you're doing, I don't think that the radiator will be necessary, but we all love overkill. The GPUs will work great in that orientation because the fans will push the hot oil out the back of the cards, straight to the top of the vat. Similarly, for the CPU I would recommend one with a very large surface area. You might even be able to get away with not putting a fan on it. Also, for the fans you put in the oil, make sure they're really strong fans. Since they'll be pushing through a lot more resistance than they're designed to, they will have a much higher strain on them. You also might want to undervolt them so they spin slower than normal (especially the GPU fans).

I love the idea of the water at the bottom; just make sure it's thoroughly tested before you put any components in there.

Oh, and make sure you clean the components with isopropyl alcohol first to clear off any impurities.