A far simpler solution would be simply acquire the ISO files. When you buy Windows, you buy the key and not the disk itself.
It's not technically illegal, as you own a copy of the OS. There is a method to what you seek for Windows XP, found
here, but it is a very difficult task. They also moved everything around in Vista to make it look far different from XP, but in reality Vista is just an "upgraded" variant of XP. With the extra "features" to cater to the masses who want eye candy over performance.