are you lot crazy!!!
The mk5/6 escort setup is terrible, shocking to say the least!!! just as bad as the Fiesta XR2i or RST setup.
The S1 or RS16i has the best handling and geomtry setup that ford have put on to a factory road car!
A S1 and rs16i has a genuine MOTORSPORT ROLLBAR which allows the adjustment of very important castor angles.
There is not another car that comes from the factory with True motorsport parts attached, even the cosworth does NOT come with a motorsport setup, it has some re-designed setup for a road car, as the magnesuim rear end for motorsport use was too expensive to be able to bolt on to a road car. So for this reason the cosworth has a crap geometry setup and costs alot to put right.
Unlike a decent mk3 or mk4 escort running a S1 or 16i rollbar.
So you asking if you could use a mk5 or mk6 setup is ridiculous. The only setup you would ever want is using a S1 or 16i rollbar.