you will need to know what module you have to see if its compatible with cruise.
vagcom will tell you this.
if you have the correct one then as niknak says, cruise stalk, no need for new cowl, your cowl can easily me trimmed to suit. and code the car to tell it it has cruise.
i wouldnt !!!! recommend vwcruise, way way to greedy.
have a go yourself , if not get some off here to do it for you , will work out alot cheaper