not sure if anyone has done this, but it will be a hell of alot of work! if it were going in a mk3 it would be easier.

youd need almost everything from the rs2k, engine, box, shafts, ecu & loom, exhaust, rad, basically everything from under the bonnet. you would need to fabricate custom mounts as none will line up with the fiesta, hubs may need swapping too, but i believe the escort ones would fit.

it would be alot of work for 150bhp and a very heavy engine, but different!!!!!

an easier swap would be 2.0/2.3 duratec from st150