At the end he write the setup cost him $20, but the display alone sells for $50 (from the amazon link he provided). I'm assuming he had a bunch of the components already, but that's not really a fair cost comparison.
I wonder why he didn't use a RP2350, it costs practically same as the older RP2040. That way it could have 450 kB or so system RAM, enough to play around with some old productivity software.
The old Macs really were the perfect form factor for a compact desktop computer—you saw them in every bedroom in every 1990s sitcom.
Are there any good options these days that are smaller than a 24" all-in-one?
Edit, this isn't the one I read but looks like the idea is older than I thought as someone was doing it in 2015:
https://www.randomorbit.co.uk/?p=904
https://arstechnica.com/apple/2025/06/new-filament-lets-you-...
I dont want to belittle the authors work, but I would call this "building custom hardware for a pico-Mac project."