I can see now that I could have misread the post and that he already has a H100iV2 and is wanting to go full custom cooling.
If that is the case he needs to have more parts than what he listed. Needs a block, fans, a radiator, pump/reservoir, tubing etc.
Nothing wrong with soft tubing. Easy to install and not as difficult as hard lines. Also easy to dismount the cpu or gpu card and block if you give yourself a long enough service loop. No need to drain or break apart the loop.
Never worked with ZMT before. Clear Primochill LRT tubing has been good enough for me. Fluid is nothing more than distilled water with the PrimoChill Liquid Utopia anti-corrosion concentrate. I don't build for bling, I build for performance, ease of maintenance and reliability.
I like the XSPC RX360 radiator as my standard build choice when I have the room for a 60mm thick one. I also just used the EX360 radiator when I needed a thinner radiator. Both are sufficient for cooling my Ryzen 3950X, 3900X and Epyc 7402P with all cores running BOINC distributed computing work.
For blocks I am running Optimus PC AMD AM4 Foundation and Ultimate Threadripper blocks. Also just put a cheap Bykski universal AMD block on a host as an experiment. Good enough and a good value at $65.
He is going to have to spend a lot more than the cost of that AIO for custom loop. I would budget $350 at minimum.
And I question why the desire for the complexity of a custom loop for 65W 2600 cpu. The AIO is totally sufficient for that load even if overclocked.