Just in case the OP still wants to know exactly how much work it is, this old thread may be helpful:
CONVERSION 2.7t A6 to RS6. That guy did the body conversion from 2004 S-Line to RS6, the Coles Notes is that it's a s**tload of work ;)
This is why you need to weld in widebody rear quarter panels:
Notice how much wider the RS6 front bumper is:
The V8 C5's are 1.3" longer in the hood and fenders:
They're also wider so you will need to replace your existing headlights with headlights from a 4.2, S6 or RS6. Other items that you can get away with leaving off, but will need to replace if you want a complete swap are all 4 fender liners and the belly pan making your parts list:
4.2L/S6/RS6 rear quarter panels/fenders
4.2L/S6/RS6 front fenders
4.2L/S6/RS6 hood
RS6 bumper supports
RS6 front bumper with grill inserts
RS6 rear bumper with grill inserts
RS6 grill for hood
4.2L/S6/RS6 headlights
4.2L/S6/RS6 fender liners
4.2L/S6/RS6 belly pan
RS6 exhaust tips
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