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You will also need to add in some bias valves to take away most of the braking effort or the first time you stamp on the middle peddle it will be like yanking the handbrake.
The drums are perfectly up to the job of stopping a Mk3 Fiesta so I would leave well alone. Even my mates 400bhp Zetec Turbo is still using the drum setup on the back
As above, drums are more than capable in a light car like a Fiesta. If you are adamant about upgrading then you could possibly look at the bigger drums that came on later Pumas, I'd imagine they'd fit without much hassle. Also be worth getting hold of a Mondeo master cylinder.