Been done, but they ARE mega fun!
http://www.btinternet.com/~rc.cars/nat99.htm
One of the oval classes would be my suggestion - thew cars are deceptively simple and a real challenge to get right. Either the 1/8th stockcars or the 1/12 stockcars, Saloons or Minis. be interesting to see what some fresh eyes came up with in the limitations of the 1/12th oval BRCA rules!
