[Arran]

Mike;
  Asbestos is water soluble, somewhat, so if you need to remove some residue that is stuck to the chassis wet it down first. You can clean asbestos much the same way, it's not like plaster where it will dissolve into a liquid or putty, but you don't want to scrub at it with a brush either, spraying it with soap and water, and then placing it to dry on some plastic or glass works. I think you could probably coat it with high heat enamel, or something like sodium silicate, both are burn resistant.
  In terms of health hazards I would be more concerned about that substance on the back of the tuning condenser frame, it may be cadmium sulfide or cadmium oxide, neither one is good to ingest or inhale as it is a heavy metal much like lead. Fortunately you can clean it off using mineral spirits or a metal polish, which will allow you to contain the dust.
Regards
Arran