it is possible and loads of people do it I just didn't fancy pulling interior trim off and causing things to rattle afterwards 
I'm with you on that mate! 
Me too, if you want that stuff then spec it. Otherwise don't rip apart your new car!
Sometimes there is a financial advantage to the retrofit or even able to add something from the VAG parts bin that isn't an option on your car model. For example my Scirocco has the stainless steel pedals, Scirocco R gearstick (much more ergonomic than the horrible one that is in as standard) and a sliding lid cup holder as the Scirocco has a horrible cheap uncovered hollow recess for a cup holder as standard. I actually eliminated a build buzz/rattle on my Scirocco when I fitted the slidey cup holder!
I'm under the impression that standard Discover Nav is the same unit as the radio, but with some additional software/controllers. If so the why wouldn't you want to pay £350 as opposed to £735 (albeit in this case you won't get the exact same system but i'm sure the option will be available in the not too distant future - you can buy MK6 Nav units for considerably less than the option price). Some after-builds are not a money saver compared with speccing originally, but for those that are, then why not (just make sure you know what you're doing)?
