The CRC's front end is almost identical to the RC12L4, so you can use the same parts. The 12L4 should be more suitable for the asphalt track in HK. A new Carpet Knife should be coming out soon anyways.
Generally speaking, a T-bar car (such as the RC12L4) is easier to tune and thus is better suited to run on asphalt (rougher surface), while a "linked" car (such as the Carpet Knife) is better on carpet or ultra-smooth asphalt. CRC also makes a T-bar car called the T-Force. Though I have no doubt that in the right hands and with the right tuning, the CK can performace just as good on asphalt as it is on carpet, and the reverse is ture for a T-bar car. The reason why I wouldn't go for the CK3.2 now is because I expect a new version to coming out soon. The team drivers already have been driving a new prototype.
