h100 is not worth to watercooling imho... use completely watercooling or aircooling...
mcp 655 meant for a huge case size... i think... i use mcp355 to handle 2x gpu and 1 cpu with 2 radiators... no problem except loud (i think something is wrong with my mcp355)
easy to google it.. and i dont make it up...
Fitting Couplings and Extenders of Expandable Length - Koolance
its pretty cool... with waterblock that has completely holes... not blind hole...