if your cab has an electric roof,heated screen,alarm it may be easier to use the engine loom and splice it into the cab loom.thats how i had mine done.
as for teh brakes,rst discs are bigger and so are the drums,but they are still pish.check the sticky in the rs turbo section,if you get cossie calipers from a granada you might get them cheaper than cossie 4x4 but they are pretty much the same but the 283mm dics needs machined down to 278mm as thats the diameter of the 4x4 disc.rear conversion is easy with the brackets and 9mm spacers.
all fuel lines are the same,tank and pump are the same,exhaust,suspension,rad,intercooler and gearbox all bolt up the same.will be very easy with an escort and your cab side by side.