If that sshd is a hybrid drive I personally never used one but seen nothing but bad stuff written online about them

Besides that you got a decent build going here

Also to answer your water cooling question

You weren't clear in custom or closed loop although I'd assume closed

Is it safe?
Custom loop totally depends on u and how you set it up and test it to whether its safe or not

Closed loop usually pretty safe, as long as u buy it retail and install directly as instructed companies like corsair will actually repay you for everything damaged if it were to break and leak, one guy on overclockers forum got a brand new $1200 build cause he had a defective unit that leaked

Closed loops are ment to be matinance free and built to not be taken apart so they shouldn't really leak

Closed loops that can be expanded you'd need to watch cause they shouldn't leak either they should be just as a plain closed loop but being it was ment to be able to be expanded or taken apart means you'd wanna check the joints and fill port to ensure there snugged up and not going to leak

liquid cooling kit is strongly required for this processor?

İ find only this under 150$

CENTAURO SERİSİ 80PLUS 1000W

What is your budget and where are you shopping for your parts?

my budget is 1500$.