I can't help you too much with that one. The best thing to do would probably be to get a V6 Contour (SVT or not), and start from that. I think the transmission will bolt up since the Zetec Foci use the MTX75 also. Someone correct me if I'm wrong. It may be the same trans with a different bolt pattern at the enging. There's probably a lot of wiring to change out also. It won't nearly be as much a plug-n-play as swapping the 3.0L into where the 2.5L was.
It can be done, but how much effort will it take? Is it worth the effort?
03 SVT Focus , 01 Lightning, 86 Ranger, 98 T-red/MNB SVTC (full 3L), Mid-Engine 91 Geo Metro [3.0L Escape motor, SVTC everything else]