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Re:Cosmopolitan Libc v2.0 by grimgrin on Saturday August 20, 2022 @09:15AM (#32531847)
Not _exactly_ what you're asking for, because certainly you're looking for a write-up/blog, however, if you haven't peeked at ape.S you absolutely must:

https://github.com/jart/cosmopolitan/blob/master/ape/ape.S

It is very commented, in a good way.

Re:Cosmopolitan Libc v2.0 by jart on Saturday August 20, 2022 @09:20AM (#32531874)
Don't forget the linker script:

https://github.com/jart/cosmopolitan/blob/master/ape/ape.lds

It has a longform explanation in the comment at the top.