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I know there were, or still are, some body kits for a '62 Vette and I think a '53 and '57 that would utilize the C5 frame, but also all the rolling chassis and interior. So not sure of a kit that is strictly just the frame. I could see someone trying to get the components, frame, chassis, etc. for these kits individually in an effort to try and avoid buying a complete donor car at one time and maybe saving some money. Maybe others have some information.
There could be a lot of frames for sale because of flood damage. A parts dealer would probably buy a lot of stuff from a broken apart food damaged car, but it is probably not worth it to buy the frame, since any body shop would declare a total loss before they need a complete frame.
So you have a lot of unsafe stuff left over nobody wants if you are a corvette dismantler , and a perfectly good frame left over from each car.
Back in the dune buggy days, people would grab something with that much potential and build a homemade hauler. I think the dune buggy days were about forty years ago, if I remember correctly, so no sale.