Power
The last 360 I set up (a 2025), the processing unit alone required 7.5kva of 208v 4 wire 3 phase. Add the requirements for all the stuff you want to connect to it when drawing up your power needs. Don't forget your backup power ... and line conditioning. These things HATE power fluctuations. They hate flaky grounding, too, so don't skimp there ... I built my machineroom/museum/mausoleum/morgue with an Ufer ground, just to be sure. It's probably overkill, but ...
What's the heat output of the above CPU? Glad you asked ... try 21,000 BTU (about 5.25 kcal), so when planning your retro data center don't forget about the electricity your AC, humidifier and air handling equipment will need ... It likes to live at about 63F (17C) and ~50% humidity, so again don't skimp!