It is really good so far but I would’ve liked it there to be more proofs from the Qur’ān and sayings of the Prophet ﷺ or the companions with citations in the footnotes although there were many citations of scholars. For an example maybe showing the proof from the Qur’ān and sunnah in the footnotes for every statement of the letter but I’ve not been on the letter yet. The first parts of the book is really good though by the translator.
Another thing, in the authorship section there should be an isnad still showing instead of saying that the chain is similar to al wasiyyah and there should be proof for every narrator being strong enough to be relied on and you can easily do this by using a statement of a scholar from the ones you listed and have the citation with page or chapter in the footnotes instead for the reader to try and find it within their books.
Even with these positive criticisms I have, so far 27 pages in and it’s nice Alhamdulillah. I would still give it a 4.6 star (which is basically 5 stars) just because of that.
