This gives some of Fiber Fab's history:
https://en.wikipedia.org/wiki/Fiberfab
However this information is incomplete. The company actually started making kit cars in a small shop in Palo Alto, California around 1964. I lived there after graduate school at Stanford (a couple miles from the shop) and worked at nearby Lockheed Missiles and Space. I would stop by the shop periodically to watch progress on the first car. It was a one man business run by Warren Goodwin that quickly outgrew the small shop and relocated to larger quarters not far away. A few years later Goodwin was arrested for killing his wife an died of a heart attack in jail. The company started out making cars (Aztec, Avenger) that were closed cars that somewhat resembled a GT-40. Later they made MG TD replicas. I'm pretty sure they never made a Cobra replica. The quality, in my opinion, was just OK, similar to most all of the kits of that era since they were made to a low price point. Apparently the company has restarted as Fiberfab US making cars that look similar to the early ones but with much improved quality.