Well, I'm working on adapting over the C5R Mini Z body to my RSX. It fits well with the wheelbase in its longest setting.
I am planning to adapt over the wheels from the model so that they fit the wheelwells the way they are supposed to. You can see in the pic that the offset is radically different.
The body mounts are almost the same at the front of the car. (Stock RSX mount is the black one, C5R is the white one) The rear will need to be fabricated. You can also see where I've sacrificed a set of wheels to adapt over the C5R wheels. I will be gluing the centers into the Kyosho wheels to make them fit.
More to come as the project progresses...