Upgrading compatibility

Hello, I'm new to forum posting but I've used them a lot for answering other questions.
Here is the background info. current build is ASUS P6T Deluxe with 2 9800GTX+ in SLI. Sadly my pc is on loan to my brother otherwise I would post pictures of the actual build.
Stock P6T photo. http://www.asus.com/websites/Global/products/vXixf82co6...

I plan to place my PC into an oil tank I built, all hardware is old enough that warranties are expired anyway. in doing this I am looking for ways to clean up the mounting of other odds and ends like my SSD OS drive, and I found this http://www.newegg.com/Product/Product.aspx?Item=N82E168...

It would allow my OS SSD to mount and power off a PCIe 2.0 slot but reading the reviews has me wondering about the slots on my board. are the only PCIe 2.0 slots the big ones that my graphics cards plug into? if so how would I go about getting at the third slot? it currently gets covered by the heatsink of the second Graphics card. and my supplied SLI cable doesnt allow me to move the second SLI card to the lower (Black) slot.

essential question 1: Would I be able to even get SATA 3 speeds from the card without sacrificing SLI Graphics performance on the P6T motherboard? If I can't get a SATA 3 PCIe 2.0 to perform with SLI on this board, then the rest of the questions are moot.

also the ASUS website specs on this board state 3 x PCIe 2.0 x16 (at x16/x16/x1 or x16/x8/x8 mode)

Question 2: if the performance is possible, how do I go about moving and reorganizing the board to fit within the normal ATX dimensions? PCIe extension cables? longer SLI jumper? liquid cooling block for Graphics?