Comms pack consists of a 16:9 display, navigation computer, audio module and can also include tv, voice recognition and bluetooth modules.
The 16:9 goes in the dash as you'd expect, but the other modules sit in the boot linked by a new loom which you have to get off your dealer. Unfortunately this means taking up the rear seats, the front passenger seat and various other bits of trim. Took me around 14 hours to do - but this involved taking lots of pictures and faffing around because of rain.
It will cost at least £1,000 to get the navigation and standard audio working. To add tv on top of this will be around £300 as you need a tuner box and an aerial & loom.
My ipod sits in the boot and is connected to an Alpine KCA-420i (£30) and Intravee module (£100). Note however, that the Intravee module is still in Beta stage, so must be bought directly from the guy who is developing them, but this shouldn't be a problem. The iPod implementation works very well with the system - will try and take some pictures of this at some point.
I will get around to writing up a guide for fitting everything.
Should be ok on a facelift saloon as shown above