Hi Jas
A Zetec install could cost as little or as much as your budget will allow.
My thoughts for what they are worth !!??
Cheapest: 1.8 Mk5 Escort Zetec lump & use the stock ECU.
Mid cost: Zetec with Megajolt, Edis4 setup & Bike carbs
Higher end: Zetec with Megasquirt & bike throttle bodies.