Done it!... what you have to do is remove the old cage. If you hold together the two single DIN units they will only just fit into the gap, they won't fit in the old cage, this was only split like it for the factory fitted CD players.
So take out the cage and what I did was place the CD player in the bottom but make a bracket to stop it from pushing back, but also removed its cage as well for it to fit. Then fit a spacer above the CD player and slide in the screen. Then you have to clamp them both together using zip straps going under them both and over the main plastic dash bit under the vents section. When all clamped that thing ain't going nowhere!
The wiring is simple, just fit your CD player with the adapter for that make and cut into it for the screen power. But cut into the ignition wire not the perm power as this will only annoy you later on when you have to turn it all off after you've turned the car off! Cut into the ignition wire for power and wire it to the neutral earth wire on the CD player.
Thats about it really... not much to it just have a lot of wires behind the HU so be carefull when pushing it all in! As for the fascia, you have to cut down from the single opening all the way through so that your left with a three sided frame, this will just clip into place as its all pretty tight when fitted anyway!
If you have any probs let me know, I did this myself, which is the best way to learn, and didn't actually brake anything this time!!