About a year and a half in the making, but super happy on how it turned out, and I hope you do as well. Cheers.

MAIN HARDWARE:

Case: Lian-li O11D XL-X (Black)
CPU: AMD 5950X
Mobo: Asus ROG Crosshair VIII Dark Hero
Ram: Crucial Ballistix MAX 32GB (2 x 16GB) DDR4-4400 CL19
GPU: Asus GeForce RTX STRIX 3090 OC 24GB
Power Supply: Corsair AX1600i
Storage: (OS) Sabrent Rocket 4 Plus 2TB NVME / (Games) Sabrent Rocket 4 Plus 4TB NVME
Vertical GPU Bracket: Lian-li O11DXL-1 Kit (modified to fit into slot 3)
Riser Cable: Linkup Ultra PCIe 4.0 X 16 (20cm right-angle)
Custom Cables: MDPC-X Carbon BTI
Fans: (2) Lian-li UNI SL120 x 3-pack (Black) / (1) Lian-li UNI SL120 x 1-pack (Black)
Fan PWN Control: Aquacomputer OCTO AQ-53286 via Aquasuite
>(1) Temperature sensor positioned under case near bottom radiator AQ-5321
Fan RGB Control: Lian-li UNI controller via L-Connect
Accessories: NZXT Internal USB Hub 3 (extra USB 2.0 headers)
Fan Metal Logo Covers: Amazon


WATERCOOLING COMPONENTS:

Pump: Aquacomputer D5 NEXTAQ-41118
Flow Indicator: Aquacomputer High Flow NEXT AQ-53293
>(1) Temperature sensor positioned near GPU backplate AQ-53227
Distro Plate: WVMech Dynamic XL D5 Side M2
CPU Block: Optimus AM4 Foundation Block (Black acetal top + matte black bracket)
>Thermal Grizzly - Kryonaut Extreme
GPU Block: Optimus Strix 3090 Block(Matte black cerakote + black gasket)
>Kingpin KPX
Radiators:
>(Top) HWLABs Nemesis 360GTS N360GTS-F2PB
> (Bottom) HWLabs Nemesis 360GTX N360GTX-F2PB
Liquid: Pure Distilled Water + Mayhems XT-1 Nuke V2 Concentrate (Clear) MXT1C250
>EK-FILL-BOTTLE
Tubing: Bitspower pre-bent 90-degree brass hard tubing OD14MM BP-BHT14SL-90R
>RIDGID 29983 1/4-Inch Hardened Steel Construction Inner-Outer Reamer
>RIDGID 32920 3/16-Inch To 1-1/8-Inch Screw Feed Tubing/Conduit Cutter
Leak Testing: EK-LEAK-TESTER
Fittings: Bitspower Black Sparkle OD14MM:

• (8) X-cross BP-BSRIGOS5
  
• (19) Advanced Multi-link BP-BSEMLA14-4P
  
• (4) Male to Female Extender Fitting, 90° Rotary BP-BS90R
  
• (2) 30mm Extender BP-BSWP-C63
  
• (1) Male to Male Extender Fitting, 45 Degree Dual Rotary BP-BS45DRG14
  
• (2) Female to Female Extender Fitting, 45 Degree Dual Rotary BP-BS45DRIG14
  
• (1) Air-Exhaust fitting BP-BSETAIR
  
• (1) Mini Valve with Rotary G1/4" Extender and Inner G1/4" port BP-MVVFRGIG14-BSBK
  
• (4) G1/4" Stop Fitting BP-BSWP-C06
  
• (1) G1/4" Premium Stop Fitting BP-BSPRE-06

TEMPERATURE CHECK:

• Ambient
  Normal: 25.0C
  Wife-mode: 30.0C
  
  
• Water
  Idle: 26.5C
  Load: 38.0C
  
  
• CPU
  Idle: 32.0C
  Load: 65.0C
  
  
• GPU
  Idle: 26.5C
  Load: 39.0C
  

NOTES

• The obvious: finding components and the wait times to receive them
  
• Not knowing exactly which/how many fittings you need for the loop until you got all the parts in there
  
• Figuring out the Aquacomputer RGB control; stuck to using the Lian-li controller instead
  
• Going through 3 different vertical GPU mounts due the weight of the Optimus block
  
• Optimus block midplate had issues, so a lot of back and forth from Optimus on parts
  
• Having to modify the Lian-li vertical GPU mount so that I can use the 3rd slot
  
• Not knowing if the D5 Next pump would fit onto the distro plate and also fitting the back panel
  
• Getting lucky with the placement of the AQ High Flow NEXT; it's literally 0.5cm away from the glass side panel
  
• Takes some trial and error to realize which tube runs to install next so it's easier for your next one