[rchippie]

There are two kinds of CF plate that are avalible . There is bi-directional & quasi-isotropic . The quasi-isotropic is stronger,stiffer & in turn will flex less. Quasi-istropic CF usually costs more the bi-directional CF. 3mm will be fine if you have a chassis brace that goes FR to RR like the onroad & 4wd offroad cars . If your trying to make a chassis with out a brace thicker CF would be better to use .