Comment by xiconfjs
I have to second this. While it takes mich effort and in-depth knowledge do build up from an “empty” cage it’s still far from dealing with everything from building permits, to plan and realize a data center to code including redundant power lines, AC and fibre.
Still kudos going this path in the cloud-centric time we live in.
While it is more complex to actually build out the center , a lot of that is specific to the regional you are doing it.
Thy will vary by country, by state or even county , setting up a DC in the Bay Area and say one in Ohio or Utah is a very different endeavor with different design considerations.