Ahh. Thanks for the heads up! I was looking at getting a replacement fascia from ebay or something to dick around with in terms of monitor mounting etc.
I have looked into it before and its the only reason I know. It seems there quite a big US focus modding community, most of the info on double din installs is from ford fanatics. I remember finding a few good installs which showed how they shaved a bit off the opening and then fibre glassed it smooth again. They looked quite good, might be worth having a look around the ford fanatics forums.