1) Guide - I am not going to make a step by step guide on how to make something like this. That would take way too long to do because this was a very involved and time consuming project. But I am happy to answer specific questions you have.
2) Pictures - Yes, I will take pictures of the inside so you can see how it all came together. I think that alone will answer most of the questions about how I built this.
3) USB WiFi/Bluetooth - I had to use USB WiFi and Bluetooth adapters because the native adapters are meant to be used with a keyboard. For those of you with a laptop you probably know that there is a hotkey (Fn button plus one of the F buttons) or physical button to turn WiFi/Bluetooth on and off. So when you ditch the keyboard or your case you lose the ability to turn WiFi/Bluetooth on and off. That means that if for some reason your WiFi gets turned off, like if you reinstall Windows, then it is stuck off. Using USB WiFi/Bluetooth allowed my to bypass this issue as I can now turn them on and off without a keyboard. And no, the virtual keyboard cannot be used for the hotkey.
4) Webcam - There is no webcam because I did not have a use for one. In retrospect it would have been relatively easy to put one in, I just never thought about it since I would have no use for it.
5) 15" Touch Screen - I used a 15" touch screen (even though the LCD is 13.4") because it was the only screen I could find that was truly 16:9 and was at least 13.4" in diameter. Most of the widescreen touch screens are 16:10, not 16:9. It does not hurt to have the touch screen larger than the LCD.
6) Mutli-Touch (Capacitive vs Resistive) - I searched for well over a month for a capacitive (multi-touch) screen that was 16:9 and was at least 13.4" in diameter and was not able to find one. That is the only reason that I used a resistive screen. The capacitive screens are more expensive, but I probably would have paid the extra money. That being said, resistive does have the benefit of being able to use a stylus where you usually can't do that with capacitive. Also, with Windows 7 you wouldn't have been able to tell much of a difference with multi-touch as it's uses are very limited. They still need to work on making Windows fully touch capable like a phone OS.
7) Power Button - On the back of the case there is a recessed Macbook Pro power button used to turn it on/off and put it to sleep. At the end of the YouTube video you should be able to see it.