I've looked into registering as a manufacturer with NHTSA. The application requires a description of each type of motor vehicle or covered equipment manufactured by the manufacturer. This requirement is impossible for us to complete as we do not manufacture motor vehicles or any equipment that NHTSA lists as "covered equipment."
Conveniently, NHTSA has a public database of all registered manufacturers. I've done a few searches and have yet to find any kit car manufacturers in the database (there isn't a listing for Factory Five Racing, Race Car Replicas, Superlite Cars or Exomotive). I'd appreciate anyone with some extra time to go ahead and search the database more thoroughly to see if they can find any kit car manufacturers on the list.
vpic.nhtsa.dot.gov
I've heard of a list of approved replicas in Florida but not a list specifically for kit car manufacturers. I will be asking about this.
Also, Ariel might not be the best example since many states have a strict no Ariel Atom policy (Texas is one) because they are not kit cars. Since TMI Autotech manufactures and assembles fully built Atoms and Nomads (aka "motor vehicles"), they would be required to register with NHTSA and the car would need to meet FMVSS.
I've contacted NHTSA, Florida officials and SEMA to see what needs to be done.