1.- I think that information is very interesting because I believe in the energy like the Chinese so, if people try it, they can use positively energy and have harmoniousy homes and life.
2.- Feng shui is, meaning "wind and water", is the art of organising builds to use this energy positively.
3.- no, I don´t know anyone has tried it or believes in it.
4.- No, I don´t Know of any buildings or places designed according to the principles of feng shui.