From the pictures we could find of your car (VIN: RBT05J89680105002), it could be a failed company that was in the Kansas area and built just a few kits (less than a dozen). before going out of business. Rollbar was one of their tell tale signatures, but then again the suspension mount on the rear end has been seen on very early NAF's, but again the rollbar configuration is all wrong for that manufacturer:
The hard mount for the master cylinder brings out more questions than answers as does the routing of the steering shaft
Again not trying to pick on the car, just narrowing down the possibilities.
Bill S.