Job is a book I've never spent too much time with. I haven't preached through it, and while I think I translated the first couple of chapters a while ago, it's my time at college which is the most engagement I've had. The key thing I recall is the importance of chapter 28, which my lecturer argued was Yhwh's speech, even though unnamed. I think it works, and with the structure as I've illustrated it, functions as a hinge between the first half (where Job responds to his friends) and the second (where Job precedes Elihu's speech).
I've based this diagram after my earlier one on Ecclesiastes; hopefully it's helpful for others also.