I could be wrong but I don't think you could use an Xray, Roche, etc. 1/12 chassis. I believe it needs to be the Schumacher, Zen Racing and maybe 1 other brand. They use different offset rear wheels that are much narrower than we use in the regular 1/12 classes. The rear suspension also seems very different from the usual 1/12 design. I assume to make things easier.

But yes, it's a 1/12 w/ a GT body