If you've had your heart set on a cossied mk4 for so long then it would be nice to see it through, get a good escort shell, then get the fab done on that.
It would be done right, all your own work and a good showpiece for Blue Oval too.
Having said that, a focus is a more modern car, will possibly make a better car at the end of it?
Fiesta would be cool too
I vote for the last 2 options