Drifter: Corally USA (in Florida) would probably be a good source here in the US for Corally parts. The problem is, that would require at least a 3 day wait for replacement parts. On a race day that would be frustrating. Concerning the foam mounted wheels, I've only raced on carpet, and TRC or Proline/Jaco are the choice. Everyone seems to go with the Jaco purple fronts and grey or white rears.

4 cell 1/12th is what I was thinking of. I have not seen a 1/12th car run with 6 cells in it. Like you, I recommend the Carpet Knife also. I found it to be a great car when I first started racing 1/12th.