Some superficial damage, but nothing serious. It's the least-likely of the three cameras I obtained to be returned to service, so I'll start with this one.
Using a miniature screwdriver and many bad words I eventually arrived at this point:
I still have a working camera, but I also have a problem. The optics are encased in metal shielding, which is soldered together. I'd have to cut or desolder to take it apart further, and reassembly would be extremely difficult. So I will put this one aside until I can get hold of a service manual. Otherwise I can still use it, although as a mains-only camera fitted to a VCR. That limits the locations it can be used in, but I'm not going to destroy it unless I have no other choice.
So, I'll move on to the next in line. A Panasonic NV-S20B. The butchery continues!