I was surprised to find that there wasn't really a thread already for this.
I've just got mine to a usable state. It's modest compared to some I've seen, but still over-engineered for a house of 3
Mine lives in the corner of my attached garage;
A quick run down of what the network consists of;
900/100 FTTH connection from Zen,
400/50 5G connection for failover from EE
Mikrotik 4011 router
Netgear GS724TP 24 Port POE switch chosen for it's big POE capacity for low (used) cost
Cyberpower CP1500 UPS that'll run everything for around 60-80 minutes and auto shutdown via NUT
Synology DS918+ for NAS, some docker services and NVR
RPI4 running Home Assistant for home automation and zigbee control
Camect for CCTV object detection and alerts
Server is old J1900 router appliance for remote ssh access/jump box and testing
Access points are Ubiquiti U6-Lites
I work from home, so one of the core requirements when I built this was that everything still works if the power goes off. This is mostly achieved by a fairly decent sized UPS powering the rack, using POE where possible and a separate 12v UPS for the FTTH ONT.
Next steps are a Dell R2x0 to replace the server with something more powerful, and an extra Ubiquiti U6 Professional AP on the ceiling in the hallway to cover the majority of the wifi in the house.
Hopefully that's interesting for some of those interested in home networks / home labs, but what I'm really interested to see is what setups other people have;
Fire away!