Actually you could build one pretty easy I think. There is a lot of misinformation floating around about the Mayhem ST. It does not have a longer chassis. As it stands right now we should see a longer chassis next spring. Right now it uses the stock RTR chassis. The things I can think of off the top of my head are.
1. The longer arm set.
2. The longer cvd’s front & rear.
3. the camber links
4. the tie rods
5. front & rear towers
6. I am not sure on the gearing but would think it would be different.
7. front & rear body post
8. you will also need an extra set of rear shocks for the front
Sitting next to a Revo