There are at least two examples that can be found of installing the SVT V6 in a Focus. If you do a search, I'm sure that you can find the posts with the photos. One of them was done by SVT.
If the 2.5 SVT engine will fit, then the 3.0 will too. It is a very tight fit. You will probably need a V6 manual trans to go with it, as the bell housing is different on the I4.
