Thanks for the advice! For now I'm gonna check out the local model store if they have some RC car tyres that can be used or modified. If that fails I'll probably go the way you advised...I'm not really eager to scratchbuild the template of the tyres, especially that the front and rear ones differ...So far I'm almost done with the baseic chassis, but I have no clue when I'll be able to make it, and make some good photos. If I do, then I'll probably start a topic, because it'd be easier to ask for help that way.