Last week I got the missing brackets and my game SSD so I was all ready for attempt #2. It is now together with Win11. I assembled it yesterday after work. I took my time, was very careful and things went together rather easily. I even managed to get some benchmarks in.

Check out this improvement from my previous rig:
XenavaX: https://www.3dmark.com/sw/321132
GigaPuter: https://www.3dmark.com/sw/415728