Still not 100% happy with the machine, but it's far closer to what I wanted for a system than my old one was looking after 6 years of just occasional upgrades here and there.
In 6 months I'll probably break it down and make a few changes, tidy up some cables, rebend some tubes - but for now this is it. First (mostly new) system in like 6 years for me.
Some parts were scavenged from several different builds, hence the K chip on a B760, and me just tossing in all of my spare large SSD's.