I stumbled across https://www.manning.com/books/build-a-large-language-model-from-scratch https://www.manning.com/books/build-a-large-language-model-f... today

I stumbled across https://www.manning.com/books/build-a-large-language-model-from-scratch https://www.manning.com/books/build-a-large-language-model-f... today - it's not complete yet, but sounds like exactly what you're after.