Tip.
Zetec-E and Zetec-R are to diffrent setups and the little trick with the bellhousing used on Zetec-E dont work on Zetec-Rs as thay have diffrent bolt patens. Easly fixed you'll need to whole lower case from the zetec-e 1.6/1.8 and just replace the zetec-r lower crank case and sump with the 1.6/1.8 zetec-e.
Wiring wise for the fiesta rip the whole lot out but leave the tail lights and fuel pump wires there and just use the mondeo loom to run everything thing esle and just tap the fuel pump and tail lights onto the mondeo loom.