Okay, you have all inspired me to try water cooling (at least look into it, I am not fully sure yet as it would completely destroy my budget). I was terrified at first but after seeing what you all have done with your PCs… I want to try! Also I applied to a RTX 3090 HC card via notify for added motivation (only 3 seconds off the last drop!).
 
The theme is that the PC is actually a manufacturing device that uses liquid nanites to produce ammunition for (insert science fiction war machine here), thus it is called “Ammunition Manufacturing Device “(AMD) get it? I have been rolling this idea in my head for a year now. 
 
It is reasonably movable for LAN parties and will be built like a tank. It even has an internal power surge / filter 2 outlet built in, for the PC power supply and monitor.
 
So far I took actual .50 caliber BMG cartridges and milled a slot into them to run cables for the monitor (power and video) and USB. The rounds will be 3D printed and help secure the wires inside the cartridges. The cartridges are held together with a burlap belt I am going to sew with buttons. This will safely latch onto the case and look like an ammo belt coming out of the PC to the monitor. You will not even see a power cord, video, or USB going to the monitor, as they are woven into the ammunition and covered by the belt. 
 
The radiators will be mounted on the outside in a 3D printed enclosure with 3/8 inch steel or aluminum bars bracing for strength.
 
The rest of the design is straight forward. I am fortunate that my work allows me to use the entire machine shop to make what I want off hours, and I also own a 3D printer. Thus, any customizing of the case will be easy (I hope lol).
 
I am still making the full 3D model in Fusion360, I wish I had some pictures for you all!  Right now I have the case spray painted camo green with a black and yellow warning strip across the front. I want to also spray paint on the side in stencil "Property of U.S. Space Force".
 
Water cooling hardware:
CPU Block: Optimus ABSOLUTE THREADRIPPER 3+
GPU: 24G-P5-3989-KR
Radiator (X2): PrimoChill 420mm EximoSX (30mm thickness)
Pump: PrimoChill CTR SFF Phase II High Flow D5 Enabled Reservoir System
 
Here are the questions I have...
 
1.) I am going to mod my current case (Cooler Master HAF XB EVO). The motherboard lays horizontal as opposed to traditionally vertical. Is it safe (or a good idea) to water cool with a horizontal positioned motherboard?
 
2.) Would TWO PrimoChill 420mm EximoSX Radiators be able to sufficiently cool an AMD TR 3960x and RTX 3090. I know about wattage, I just wish they stated what it dissipates on their site.
TR 3960x (not overclocked)= 280W, RTX 3090 = 350W to 550W?
 
https://www.primochill.com/products/primochill-420mm-eximosx-slim-radiator
 
These are mounted on the outside, I am not restricted by size. I can even go up to
PrimoChill 540mm EximoSX Ultra Radiator (40mm thickness) X2 if this would provide a meaningful increase in cooling…
 
3.) Does the pump I selected have enough strength for the system?
 
If this is a good idea and the parts are compatible?
 
 
I made a very rough 3D model of my idea:
 
Version 1 water cooled= 2 x 420mm radiators.

Version 2 water cooled= 2 x 540mm radiators (if the cooling power is needed)

 
Version 3 Air Cooled not water cooled= modified CPU heat sink fan setup.
I do have an air cooled variant as well, looks the same (minus the radiators and pump) but the CPU has a dedicated 140mm fan blowing air in and and another 140mm fan exhausting air right after the CPU heat sink. This is my current fan set up, it dropped the temps 10C on the CPU! I am also looking at placing a 3080ti or 3090 for this air cooled variant, EVGA or bust lol. 

Prototype CPU fan setup:

 
Thank you to everyone for the help, especially:
Nike_7688 (Project Dark Water) for the power supply tip.
arkjas92 (Project BEHEMOT) on your crazy design inspiration.
Dabadger84 (Project Rainbow Wind Tunnel LUL) for the idea to directly place a fan over the ram.

Thank you for the reply!
 
1. That was my crude optiumus D5 pump 3d model lol. Glad to know that I can mount it like this, I want to keep as much fluid out of the computer case as possible. 
 
2. I was going with the thin because it was the only one 420 primochill sold. However I have considered getting thicker 420 radiators (any good brand at this point) and push/pulling, I can make them as thick as needed (60mm is an option lol), I will just remake the brackets. I am only limited on radiator length, thickness has no limit. 
 
The radiators will always have a fresh supply air from the open bottom. The heated air is exhausted at an angle outward / upward to avoid recirculating hot air back in. No matter how I arrange the radiators on top this method will be maintained to ensure maximum cooling. 

Air flow detailed:

3. I am not opposed to a good dual pump (you can never be too redundant), I as looking at this one a log time ago:
https://www.ekwb.com/shop...wm-serial-incl-2x-pump
 
I am crossing my fingers that the 24G-P5-3989-KR drops soon! That is one of the reasons I am water cooling, that, and the Threadripper puts out crazy heat!
 
I will have more pictures of the ammo belt as it is completed. Funny part was my work allowed me to use their machines mill out the 50 caliber rounds, lol my work place is epic. These are authentic 50 caliber rounds that will hold the wires to the monitor (power / video/ USB) from the PC (has a built in surge protector). I made 40 of these, the belt is around 3 - 4 feet. After that it will just be fabric.
 
WARNING prototype it will look better when it is finalized....
Closed up:

Opened:

The idea is to latch this belt securely to the PC, if I am LAN gaming and some one tugs (or lets hope not trips) on the cord, the stress is on the frame of the PC not the ports. 
 
 
 

To be honest I cant even find 50 caliber shells anymore, I would think the bullets would be very heavy and hard to find.
 
The bullet tips will be 3D printed with a groove that surrounds the cords in the bullet casing, further protecting the wires. I was worried about gouging as well but the opening is filed smooth and the wires are so snug that I have not noticed anything during testing. Maybe a set screw to hold the bullets in place, I can tap the brass casing maybe. I want to always be able to change cords if needed. The 3D printed bullet tips will be finished by placing each one in a lathe with some sand paper. After a bunch of brass spray paint and clearcoat, sand in lathe again to a good finish, then clear coat. I may make a screw go up the center to give added strength to the layers.
 
Or I can buy plastic rod and cut each in a lathe via a stencil. 3D printing is easier lol. 

Such a cool project! You have some very good ideas, and access to some nice tools to get the job done. I hope you enjoy the build process. 
 
Edit: I think the 3 fan version looks better as in it fits the dimensions of the build{case} better.  Like Nike_7688 said about rads: Go for thicker ones and match the fans, or use a controller. The better cooling, the more you can turn the fans down. With your rads being external, you won't have to contend with the case heat, as much. 

Are the rads still being mounted externally as in the models above? If so, you probably have enough. I would just worry about air-flow of you're trying to put those in this sealed case now. You'll probably still want some fan in there at least circulating air for the vrm and stuff. That's a cool ammo can though. I think the 40mm were the grenades you'd have the under-barrel launcher on for an m16. Makes sense with the M16A2 print as well, but I'm not quite an expert on military firearms lol. I'll have to let others weigh in on if two good 360's are enough. I'd like to say yes, but those are some warm components... So I don't know for sure. It might depend how much you want to OC them :-)

Dude. That looks awesome.

As long as 2 of those 360 radiators will keep my GPU and CPU cool, I will purchase the watercooling parts this week. I was playing around with 420 radiators, but they are a bit to massive and reduce the portability of the case...

I will also try to find a way to add a 3rd 360 radiator to the cad model tonight.

Cleaaaaaan

I like it. I've also always been a big fan of these:

interesting project

big moves! good luck!

This is an awesome build idea, cant wait to see the finished product.

She's gotten taller than the last design you showed! Lol it is looking awesome!

I have the optimus d5 res. It is fantastic. I got one of the blemished ones and there's the slightest scuff underneath the pump housing where you can never see once it's installed. They definitely make some high-quality stuff.

can't wait to see the final rig!

that is very unique. Definitely not something you see very often