I honestly don't think you would hold a delivery more than 5 months just to make a pun.
In regards to your other questions, the book is 600 pages, I got it yesterday and I have a day job.....I will let you know.
But based on the reviews at Amazon I don't think anything will be left out from abandoned story ideas to the technical challenges. Remember, at the time doing everything digitally was a risk and one that Lucas did take a lot of criticism for but still he had to lay the foundation for the digital production world we have today. Remember, it was written from a 2020 perspective so it should talk about how what we take for granted today was a huge challenge 20 years ago. That has to be a good part of the book's narrative and the reviews do give that impression.
Reading about those technical challenges is entertainment to me.
As I said, I really don't get caught up in the Star Wars mythos so books on the floor plans of their vehicles like you recommended really don't interest me. I just want a good story that makes sense and characters I can root for. That's about it....unfortunately, I can not say that about the sequel trilogy.
Dave
P.S. I noticed that the price of the book has gone up $30 since September.