We recently purchased a 2006 T1N cargo to do a camper conversion on and also bought a copy of that e-book.
One, I can't resist buying books
and 2, I didn't know where to even start or what questions to ask.
The book offers a good background for conversions and has a lot of product info. Some of the info came from this forum but it is nice to have it all in one place. The main thing it did for me was to provide a starting point.
I hope this helps.