Id do two separate loops .... using Asus Rampage VI Formula and two Asus Posiedon GTX 700 GPUs (hoping for September release)
Here's a interior reservoir build.....
http://rog.asus.com/forum/showthread.php?33364-Maximus-VI-Formula-Show-Casemod-MbK
This is a bay reservoir s build
Here's one I posted earlier:
I'm by no means an expert ..... but this is stuff ya might consider for full WC
GPU Loop
Crystal Link Tube Set .... This is 4 slot, 2 - 5 slot options available
http://www.frozencpu.com/products/10746/ex-tub-671/Bitspower_SLI_Crossfire_Crystal_Link_Tube_Set_-_4_Slot_Spacing_BP-CLTAC-S4.html
Tubing Adapter .... Bitspower SLI / Crossfire Multi-Link Adapter Pair - Matte Black (BP-MBWP-C47) 2 for Crystal Link,
http://www.frozencpu.com/products/10743/ex-tub-668/Bitspower_SLI_Crossfire_Multi-Link_Adapter_Pair_-_Matte_Black_BP-MBWP-C47.html
Tubing Adapter .... Bitspower Matte Black Ultimate G 1/4 Thread 3/8" ID x 1/2" OD Rotary Compression Fitting (BP-MBRCPF-CC2) 2 for GPU connections, 2 for Pump, 2 for Rad, 2 for reservoir so 8
http://www.frozencpu.com/products/11107/ex-tub-700/Bitspower_Matte_Black_Ultimate_G_14_Thread_38_ID_x_12_OD_Rotary_Compression_Fitting_BP-MBRCPF-CC2.html?tl=g30c409s1032
Radiator - Alphacool NexXxoS UT60 Full Copper Triple 140mm Radiator 468 x144 x 60mm
http://www.frozencpu.com/products/16826/ex-rad-427/Alphacool_NexXxoS_UT60_Full_Copper_Triple_140mm_Radiator.html
Radiator Gasket - XSPC 3 x 140mm Radiator Gasket - 3mm (2 for pull / 3 for push pull)
http://www.frozencpu.com/products/16826/ex-rad-427/Alphacool_NexXxoS_UT60_Full_Copper_Triple_140mm_Radiator.html
Reservoir Pump - Alphacool Repack Dual 5.25" Acrylic Reservoir - Clear - w/ D5 Variant Pump Installed (15171) and Swiftech MCP655™ 12v Water Pump w/ Speed Control Option (+$15)
http://www.frozencpu.com/products/20791/ex-res-616/Alphacool_Repack_Dual_525_Acrylic_Reservoir_-_Clear_-_w_D5_Variant_Pump_Installed_15171.html?tl=g30c97s152
CPU Loop
Radiator - Alphacool NexXxoS UT60 Full Copper Dual 140mm Radiator 324 x 144 x 60mm
http://www.frozencpu.com/products/16825/ex-rad-426/Alphacool_NexXxoS_UT60_Full_Copper_Dual_140mm_Radiator.html
Radiator Gasket - XSPC 2 x 140mm Radiator Gasket - 3mm (2 for pull / 3 for push pull)
http://www.frozencpu.com/products/20857/ex-rad-629/XSPC_2_x_140mm_Radiator_Gasket_-_3mm.html
Reservoir Pump - Alphacool Repack Dual 5.25" Acrylic Reservoir - Clear - w/ D5 Variant Pump Installed (15171) and Swiftech MCP655™ 12v Water Pump w/ Speed Control Option (+$15)
http://www.frozencpu.com/products/20791/ex-res-616/Alphacool_Repack_Dual_525_Acrylic_Reservoir_-_Clear_-_w_D5_Variant_Pump_Installed_15171.html?tl=g30c97s152
Water Block - XSPC RayStorm High Performance Acetal CPU Liquid Cooling Block - Black Edition (Intel) (Sockets LGA 115x / 1366 / 2011)
http://www.frozencpu.com/products/16546/ex-blc-1168/XSPC_RayStorm_High_Performance_Acetal_CPU_Liquid_Cooling_Block_-_Black_Edition_Intel_Sockets_LGA_115x_1366_2011.html
WB Cover Plate - XSPC Aluminum Red Edition Mounting Face Plate - Intel Raystorm CPU Block
http://www.frozencpu.com/products/20746/ex-blc-1485/XSPC_Aluminum_Red_Edition_Mounting_Face_Plate_-_Intel_Raystorm_CPU_Block.html
Tubing Adapter .... Bitspower Matte Black Ultimate G 1/4 Thread 3/8" ID x 1/2" OD Rotary Compression Fitting (BP-MBRCPF-CC2) 2 for Water Block, 2 for Pump, 2 for Rad, 2 for reservoir so 8
http://www.frozencpu.com/products/11107/ex-tub-700/Bitspower_Matte_Black_Ultimate_G_14_Thread_38_ID_x_12_OD_Rotary_Compression_Fitting_BP-MBRCPF-CC2.html?tl=g30c409s1032
Tubing - Tygon 2475 Ultra Chemical Resistant Plasticizer Free Tubing - 3/8" ID (1/2" OD) - Clear (ACG00027) .... Figure 10 feet
http://www.frozencpu.com/products/10691/ex-tub-663/Tygon_2475_Ultra_Chemical_Resistant_Plasticizer_Free_Tubing_-_38_ID_12_OD_-_Clear_ACG00027.html
You will need (3) 140mm fans for the GPU loop and (2) for the CPU loop....consider later if ya want push-pull.
If ya case cant mount 140's .... then change to 360 and 240 rads
Accessories..... fluid ....distilled water recommended .... if ya must have color look at the Mayhem pastel stuff....think about biocides and corrosion inhibiter additives.
Funnel ?
http://www.frozencpu.com/products/10772/ex-res-193/PrimoChill_-_Threaded_G_14_Funnel_-_Black_PC-GF-BK.html?tl=g30c101s1206
Some 45 and 90 bends might come in handy.
http://www.frozencpu.com/products/11887/ex-tub-737/Bitspower_G14_Matte_Black_Dual_Rotary_45-Degree_Compression_Fitting_CC2_For_ID_38_OD_12_Tube_BP-MB45R2CPF-CC2.html?tl=g30c409s1321
http://www.frozencpu.com/products/10751/ex-tub-675/Bitspower_G14_Thread_90-Degree_Rotary_38_ID_x_12_OD_Compression_Fitting_-_Matte_Black_BP-MB90R2LCPF-CC2.html?tl=g30c409s1302
As to the metals issue..... best advice is minimize dissimilar metals. Many have expressed concern about the aluminum HS's in the Formula MoBo....Asus responds that it is both anodized and coated. Id avoid the chrome and use the Bitspower fitting above.
Switch to cylinder reservoir if ya case don't have the bays available.
AquaComputer Pump Adapter w/ Aqualis Reservoir and Pump Installed + $15 variable speed pump option
http://www.frozencpu.com/products/16994/ex-res-422/AquaComputer_Pump_Adapter_w_Aqualis_Reservoir_and_Pump_Installed.html?tl=g30c97s152