Il put my hand on heart and say fitting my st170 box into the Fiesta was the biggest ballache of building the car.

Once done though its by far one of the best upgrades.

If you can do all the fabrication yourself like Crazycage has then it may seem fairly straight forward.
But as Christian has stated it is not as simple to do may be easier in a Fiesta than an escort who knows!

Either way its certainly more complex than a bish bash bosh and your done!