I built one like this but taller -
https://tombuildsstuff.blogspot.com/2014/02/diy-server-rack-plans.htmlOn the bottom is an APC 1000 UPS with upgraded batteries. It's huge and not rack mountable.
Next is a 3U spot for the unRAID server I'm building. I have the iStarUSA case that can hold a dozen 3.5" drives.
Pyle PDBC70 rack mount power strip. I like that each outlet has an on/off switch.
24 port patch panel
TP-Link 24 port managed switch
Shelf with a Ubiquiti EdgeRouter Lite / Lenvo ThinkCentre running Pi-Hole
Shelf with my NVR and NVR POE switch
3U shelf with 4 NAS drives (Zyxel, Hawking & Buffalo)
2U shelf with 1 NAS drive & 1 USB drive (Western Digital)
1U empty
4U locking drawer. I was unsure if I would use it and now it is full of frequently used things like my Ethernet cable tester and my cable crimper.