you need to do a search on this forum because all the info you need has been given before by people al lot more knowledgeable than I.
but it goes something like this.
ECU
CODE box
lockset.
Fitting of the first two is I imagine feirly straight forward
The lockset would probably be a pain though. Don't forget you would need
ignition,
2 door locks
boot lock
petrol cap.
The chances of finding all of those from the same car in a scrappy, along with the red key must be fairly slim.
I don't know if there were different versions of the 1.4 but sometimes the wiring differs so you would need to check the boxes are compatible.
Unless it was dirt cheap (or even better Free!)
it may prove more of a hassle than a bargain.