If it where me id be getting a doner zetec xr2i fiesta.. you will need to make up engine mounts and probs a box mount.. the zs uses a hydraulic clutch so you will need to sort that out. Id use the zetec fiesta loom in place of the zs one... I have seen a focus rs powered mk5 so maybe try and find the thread on here the guy could help. P.s ive not done this before but thats what id do