Back in 2014 I decided to draw up some plans to have my “Peepaw” build a box I could stick a computer in. Once I sent him the plans, he put it together in under a day. I picked it up and rigged it out. I use it to host virtual servers via Proxmox these days…
The fans from the side provide adequate ventilation – it idles around 50°C. Not super cool but good enough for my needs.
Wooden Computer Box Case