Remember when your mom asked you, "if your friend jumped off a bridge would you?".
Just because the XYZ Donkey Punch 12 has a 5mm pocketed chassis that doesn't mean that's a good idea.
The stock RC 12L4 with a .090" carbon chassis still wins every were. Paul Lemieux won Cleveland with a 2mm lower chassis on his FK05 and won the Novak race with a T2 that was all 2.5mm. Carpet racers have this stiffer is better mentality. This is true to a point but there is a point of diminishing returns where the a thicker chassis is not stiffer and just weighs more.
.090" carbon (~2.25mm) weighs 24% less than 3mm carbon. You can get quality 2mm, 2.25mm and 2.5mm high modulus quasi-isotropic carbon that is way stiffer than many commonly available sheets of imported 3mm carbon.
There are improvements to be made such as lowered pods, slightly longer pods for more gear options, front track width, wheelbase and better front end designs. Lets concentrate on 1/12th design aspects that generate real improvements and stay away from lead sleds made from 1/4" thick carbon.
What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series