This is site that a friend shared with me some months ago. And it is PURE gold from my point of view. They share a lot info free but not all, you have to subscribe/pay for the whole report. I would pay for it if my job were in that “business”
This is the link for a 100k GPU cluster.
It covers all details for building such infrastructure up to the network/hardware side. So from power distribution, cooling, racking, network design, etc. All is there.
It is something to read slowly to try to digest all the info.
This report for electrical systems (p1) shows the power facilities can be as big as the datacenter itself! So it is not rear to read hyperscalers want nuclear reactors.