A modification to a design by Michael Schoeffler. Loved the original but I didn't require exposed GPIO, found the need for a fan guard, and closed in the OLED display area
Original available on Michael's site.
HiFiBerry Case
Amazon.com: HiFiBerry HighPi Raspberry Pi Case - Raspberry Pi4 : Electronics
Waveshare PoE Hat (B)
https://www.amazon.com/Waveshare-HAT-Raspberry-PoE-Switched-Mode/dp/B07Z1Y47C7/
The author hasn't provided the model origin yet.