I wouldn't go so far as to call this "major", but I have used factory cedar panels in creative ways. Also, I have one of the only (if not THE only) Startech steering wheels (Sportslenkrad) from Germany, in cedar leather. This steering wheel was standard in the Startech Crossfire, only sold in Europe.
Future plans for the SRT-6 interior:
- Perforated Nappa leather shift **** (slate), w/ slate boot & cedar stitching.
- Paddle shifters on steering wheel
- CTD-Germany gauge cluster *****
When I had my Limited, I had the steering wheel as well as AMG gauges installed.