The pattern is pretty simple to create. Once you have the black undercoat done you create the effect by pulling the silver coat off. Once the silver coat is sprayed and while it is still wet you use a piece of plastic with the same consistency as that of glad/cling wrap (note: I found that cling wrap actual pulls the paint, it sticks too much and is messy, doesn't give a clean effect than just normal plastic) to cover the object. Then you pull it off, it will take some of the silver paint off and that will show the black underneath.
The engine covers were the second piece I did and was pretty simple. You just have to make sure you clean, sand and prepare them correctly. Then it is a simple matter of painting them. It isn't difficult.