How would I go about making a cake in the shape of Roary the Racing Car?

[spicemonster]

I know how to make cakes but have never tried anything like this. Do you have to get special icing? Is it absurd of me to even try? I'm quite artistic but that's the only thing I've got going really

vroom vroom! My lo would love your cake, she's going through a roary phase at the mo.