and unlike the old case, doesn't need some of that space for airflow (though it can be configured that way)
needs a separate non-m.2 boot drive, but why not two? zfs mirror, for kicks. still need to copy the live server's boot drive, but waiting for new PSU to bother.
also installing a disk drive in a computer for the first time in a long time. really getting use out of 8 more SATA data connections and a PSU that can do at least a dozen.
was maybe a little less careful with the SAS-> SATA cables than I should have been, but I like the end result
if you haven't installed your PSU yet, you can pop off the PSU cover and pull hard drive cages out that way.

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