Did a quick search of the Focus Forums and found this:
http://www.focaljet.com/ubbthreads/showflat.php?Cat=0&Number=2416443476&page=&fpart=all&vc=1
It's a long read, but a lot of good info.
One thing though, while our engines and the Focus have the same oil filter, filter location, and oil pickup points, the plumbing for the hoses and heat exchanger probably won't be the same, but shouldn't be too hard to fab up.
EDIT: An oil cooler isn't really needed unless you plan on doing a lot of back to back racing, i.e. all day drags or road course stuff.