Coupe Quattro shopping

[McLoffs at aol.com]

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Hello. I'm shopping for a 1990-1991 Coupe Quattro, and have a few questions.

1. How difficult is it (assuming it's possible) to upgrade from the old-style
control stalks on the steering column to the newer style?

2. On airbag-equipped cars, is it possible to upgrade to the later
three-spoke sport wheel?

3. Is it possible to upgrade the sunroof control of 1990 models to the rotary
control of the 1991 models? If so, is it terribly difficult?

Thank you,
Mike McLaughlin
(looking forward to having an Audi again)