It has been done before by MTM in Germany. The car is called MTM Audi RS6 Clubsport, here is a test video from german tv
http://www.youtube.com/watch?v=mhFoJIGvNMEat 3:28 the testdriver talks about the fact that they converted the car to manual transmission.
i hope i could help you a little bit,
greets from germany
That's a S6 conversion to RS6
There were a lot of myths according this conversion.
Different gearbox housing layouts etc.
I can't check this, but old V8 automatic gearbox and 01E gearbox had the SAME design.
How ever.
Can't you leave the TCM in the car?
Some guys told me you have have to update the instrument cluster panel.
But I checked this:
http://ok-chiptuning.de/According to my information they did a "real" RS& MT conversion.