Building a WiFi Router from (mostly) Spare Parts

Some time ago, I set about building my own wireless router. Why? Well, I wanted to see if I could put something together that would (theoretically) be upgradeable rather than disposable once standards moved on. I also had an existing setup (Unifi DreamRouter from their defunct early access program) that could not do the latest speeds, was limited to 1Gbit, and would be a good fit for upgrading my…