Yes you can Watercool memory and an SSD. But start watercooling all that and you'll need one hell of a reservoir and some big radiators. 4 Video Cards is a lot to cool. For the money wasted on that stupid system get an air conditioner/heat pump/mini split installed in the room where the computer will be located.
The best case would be a Corsair Obsidian 900D. Now for the liquid cooling don't put a $100 all in one corsair on an $11,000 PC. You want modular. EKWB or XSPC are 2 companies that make water cooling components. You'll have to add water blocks to each video card, then combine them all together and go to your rads and reservoirs. Your talking $1000 to cool all that. And in a years time a $2000 computer will probably smoke that system lol.
Why 8 SSDs? Why not 4 512GB versions? Actually 2 1TB versions striped would be better. Since you're going all out why not an M.2 PCIE hard drive like a Kingston XFury or Samsung. 8 memory slots filled. I could go on and on. Is this a gaming system or a server for a datacenter? You seem to have some weird hybrid child of the 2 going on.
Also why the headset. For that price you might as well go with an external DAC, headphone amp, and decent set of headphones. Or a decent sound card and decent headphones and a YETI mic.
I'm also not sure gaming on 35" monitors is the best idea either. Unless you get wireless keyboard and mouse and stand back 10 feet. 24 or 27" is better for a desk. Many people even say 27" is too big for an eyefinity setup.
lol at the $60 surround speakers. At the very least get an Emotiva receiver and some real speakers.
Anyways to answer your question you need to build up your own water cooler using components. You purchase the reservoir, pumps, radiators, fans, water blocks all seperate and attach them together with tubing. Add the liquid, purge, and run. EKWB and XSPC are 2 companies selling such products. Check NCIX they sell all their products.