You're absolutely right. Mounting a 991 steering wheel to a 997 is pretty much plug and play. However the size difference makes it also more heavy to turn. I did it to my 997.1 Turbo, but the original steering wheel is actually a much more pleasant driving experience, imo.
Not squashing a Beetle is also considered good design as well by the way. The New Beetle is one of the best looking cars on the road, deaigned by the same guy that drew the original Audi TT and Chrysler Crossfire. Not the New New Beetle... You get which one I mean.
