Can anyone recommend a Thucydides reader with facing vocab and commentary for the entire work? I did a search on Textkit and found http://discourse.textkit.com/t/thucydides-good-translation/15577/1 which I assume means people are using an English translation and separate commentary to read Thucydides.
But if something like a Steadman exists for the entire Thucydides, I would really like to know!
Certainly this will exist in Latin, but I doubt whether it would in English (for the whole of Thucydides).
I don’t know of one and kind of doubt you’re going to find such, at least in English. But in addition to the Textkit thread you linked to, here’s another one that has some very helpful information about resources (see especially the contributions of John W.).
Thanks Callisper and Randy! I actually bookmarked that thread prior to posting because it seemed likely to be useful. 
What are these Latin commentaries with vocab that are mentioned? Do they exist for most Greek works?
Maybe these:
Ah sorry - I misunderstood the focus of the question - I doubt whether there would be anything would facing vocab. That said, Neo-Latin commentaries and translations of all Greek authors proliferated in the Renaissance and I could provide some pointers on that. Let me know.