I've been thinking more about this viewpoint, and I think both simple kernels and simple browsers are possible for an enthusiastic hobbyist.
https://twitter.com/patio11/status/1064394542776934400
miniblog.
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There are docs resources like https://diataxis.fr/ that categorise documents based on format and intended audience.
They don't say where you should start, or what order you should write docs.
I'm currently thinking README > reference > tutorial > how-tos. Agree/disagree?
On thinking of books like software, treating them as evolving artifacts, and URLs versus paper book publishers:
Thinking more about the "auto eval definitions" approach, I think it breaks down when debugging. If I want to step through the existing definition, it'd be really awkward to re-evaluate the definition at my cursor.