imho its not worth spending loads on modding the focus to accept the cvh engine when a fraction of that money can be spent welding the combi up and dropping the cvh in there.

pluss it aint gonna be a weekend job to convert the focus so if you rely on the focus i wouldnt bother. as said all the water pipes, inlet, zorst, pas pump, a/c?? etc is different. not sure what you would do engine mount wise either as the focus drivers side mount is next to the cam belt on the inner wing and chassis leg.

i know its possible to do in a mk6 escort fairly easily but the focus was designed around the newer zetec e and se range of engines.

admitidely it would be something different but as zetecs are cheap, easily modable and drop straight in with more power outputs and better drivability you'd prob get laughed at by most.