Cracking car!
Any more info on the focus coilovers? Do they basically (apart from the spacer required) fit right on? Any specific model of focus?
Since my dampers are just old and tired but not leaking I was going to modify them to make them refillable, fill with heavier weight oil to "uprate" slightly and put on a set of basic lowering springs, but your way could be easier? Was it much grief to get them on and sort out the ride height issue?