I channeled Ray Harryhausen again - enter Medusa's Lair! Sculpey, craft moss and dollar store clay met and made this little display number. The clay actually worked out better than I hoped - since it's cheap, weak stuff it cracked when it dried, which made the scene even more derelict!
The display case is a jewelry box (or something) from Ikea which protects it from dust. Credit to Mrs Puppet for that suggestion.
Big photos beneath: