Carbon chassis did not work in rc off road for a reason that no one gave you yet, it is called "heat dissipation ", carbon as well as titanium has a very poor heat conductivity, meaning that once heated it cools down very fast and does not conduct the heat very much further than the spot heated. So in fact engines do overheat on a carbon chassis as well as titanium chassis as the chassis in a 1/8 buggy participates to the cooling of the engines, that's also why you could see a part of aluminium in that chassis on a picture someone posted on your thread.
Plus carbon takes heat but not the epoxy holding the sheets together,and that is also another reason why once cooked by the heat generated by the engine it tends to delaminate.
Hopes this helps you.