Nice work. Everyone thinks "raspberry pi" for simple single purpose devices like this but often old thin clients offer much greater bang for buck and are way easier to flash while having x86 compatibility.
Discussion
Yes, just Debian server under the hood. The thin client would make you hate life as a desktop but it was 1/3 of the price of a pi 5 and way more powerful.
I love recycling ewaste. Old workhorse office towers make good servers and mini computers are great nodes and services.