Just out of my memory:
ATX to MTX Swap (Donor car plus ~20 hours or less labor)
200HP Turbo Kit from DemonDynamics ~$3000
So I would say you could have a 200 HP Zetec with low drivetrain loss for anywhere from $4000-6000.
If you do not have anything into your car, it would be more advisable to sell your car and buy an MTX Zetec, you could actually make a profit versus losing money via ATX to MTX swap.
And there are several more turbo kit options for the Zetec, you could shop around. PerformanceFords and Tom (check Forced Induction) come to mind.
