That's a very neat project. If you ever need to mate something light sealed consider using a clay mold (using a thin plastic bag so you don't foul up your positive, in this case the camera), sculpt to your liking after the first imprint and then fill with resin for a very nice result.
There is also rubber that you can cast. Be careful, most of these resins/hardener compounds are highly exo-thermic while they cure, make sure you keep things cool or spontaneous combustion or deformation are possible.
There is also rubber that you can cast. Be careful, most of these resins/hardener compounds are highly exo-thermic while they cure, make sure you keep things cool or spontaneous combustion or deformation are possible.