Scampy
I don't want to rain on your parade but if you intend to run that Smart Car at a sanctioned track it has to be certified as an Exibition Car and that requires up front approval from the sanctioning bodies. That means you have to submit a full set of detailed plans to both IHRA and NHRA prior to the build process. It may take a while to get all the paperwork signed so be patient.
I do hope you go through with it and Good Luck with the project.
sscuda
=P~