I've got a pair of C-cat hulls in my back yard that I intend to *someday* get back on the water. The boat came out of the LA area, my understanding is that it was one of several of the same design that were built for a local yacht club in the '70s.
The hulls need a lot of repair work. The mast is pretty mickey-mouse, so I'll probably end up replacing it. It has a soft uni-rig, with external wooden battens, so I'll replace that too. I also need cross-bars and rudders.
If/when the local beach-cat racing scene dies out to the point where its no fun to campaign my Nacra 5.8, then I'll put some money and effort into getting the C-cat together. Right now it's a low priority item.