If the car was built/assembled in 2003 from a CMC kit then it was probably built by a hobbyist, not by one of the recognized makers such as Intermeccanica, Special Edition (Beck), SAS, JPS or Vintage.
Given that, it could have been done very well, rivaling one of the factory builds, or at any level down to terrible.
If you aren't familiar with these cars and you have a serious interest, you might appeal to someone on this site to evaluate the car for you.
There are knowledgeable Speedster owners all over the country.