I have been reading this book for a while now. FYI, I know nothing about the device and the SDK, while totally being interested to learn it. I have bought this book and I am gradually learning things that are new to me. I don't know why you are fustrated. I used to get fustrated when I cannot understand the code or cannot run the code. But this book has made extra-ordinary work by pulling things that are rarely found over internet. Believe me, I would recommend this book always for a newbie.
I think probably you might not be very competent on technologies used on the book. I dont know if you are aware of WPF or other ongoing technologies which are widely used on the book.
Let me go a little on your findings and let me try out them myself.
1. You seem to have managed to build InfoBox sample, that means you have a real device with you and it is connected.
2. It does not give complete picture of Skeleton Tracking. Well, it is true. I think you need to read the book further to get the entire idea. This chapter overlooked on it intentionally I think, because there is a separate section for the same.
3. Hmm, yes, there are sections which are intentionally cut down to decrease the page count. I know it might be hard for a beginner like you to code it completely. But probably this book is not intended to give insights on actual programming, and I think you need another book to learn WPF and/or windows programming before you can go with this book. This book is intended only for Kinect SDK.
4. Page 169. I dont know why the code sample Failed for you. Did you added proper namespaces? As I see the code uses Linq, and probably you need to add that namespace in addition to the SDK ones. Can you specify your error message so that we could get an idea what you are missing (probably if you cannot fix it yourself).
5. SensorChooserUI is not a part of SDK, it is a part of toolkit. I think the book already states how to use Kinect developer toolkit in Page 205.
I think you should read the book again before you comment again.