They were built up in Washington State and then towards the end back east as well. They were a major player in the late 60's and through the 70's. Side by side with Bayliner in models available. Towards the end they expanded from the max of 28' up to 34'. They called that line Fiberform "Executive Yachts". They were heavily built, but like most of the other brands of their time, they eventually suffered from rotten stringers, floors and transoms. There are quite a few always for sale on BoatTrader. Bayliner ultimately bought them out in the early 80's and then disposed of all the molds and shut them down. End of that competition! We had a 1973 Fiberform tri-hull that we bought during the oil crunch. Great deal at the time. It came with a six cylinder MerCruiser. We sold it off in the late 70's for a profit
There are quite a few websites representing the Fiberforms. Owners clubs and all.