Good timing - I went to the factory in Ingolstadt on Friday on my way home from my Swiss, Austrian, Italian mountain passes drive with a friend of mine.
2000 miles in 4.5 days, including 7 passes in one day but loved every minute of it. The 3.2 was fantastic but it did struggle to get above 12mpg going up the Stelvio Pass (49 hair pins in about 10 miles)! I did average 29 though, but with very uphill there is the other side which helped and also lots of slowish driving through the valleys.
I could go on as it was such a great trip (might do in another thread) but back on topic, I booked an english speaking tour about a month before, which shows you round the A3 factory for 2 hours. Every day at 11.30am and it costs a whopping 4 Euros! 20 people on the tour and you must book.
You see from the pressing of the metal panels through to filling with petrol / diesel and final road testing. Might sound a bit dull to many but I found it fascinating to see what goes into making a car and how efficient it is.
They build 900 A3s a day there, and we saw all variants including American ones, left and right hand drive, 3dr and Sportbacks all mixed in on one line. Even saw some new S3s on the line and a couple of finished ones too (not sure about the exterior myself). The marriage of the engine, transmission, suspension and brakes etc to the body takes less than 3 minutes. Each A3 takes 35 hours to make, of which 15 hours is the paint process. The factory we were in is 1.2km long too and everyone has a bike to get around on (bike racks everywhere). I was surprised to see an ice cream van in there though!
They have a dedicated section for those collecting their cars and you get a tour thrown in (as you would expect). There were about 6 people collecting every 15 minutes (a big collection board had names on it).
Any more info, let me know. I have the Audi docs about the tours which I can email if helpful (don't have any web space) unless anyone can suggest how to attach here?