The plaster base for the fossil diorama

Now this terrain technique is the same my friend JBA used to do hie the Womb diorama: that's a  plaster rectangle on which was put some veruy thin plaster sheet that you can find at the bottom of used plaster cups if you see what i mean. This is very thin plaster that is then sort of fixed using some VERY diluted plaster on the top.

So here will be the proportions of the scene after the metal piece is placed, I think I can start the paint now..