Looking at my chair to transform into a Vermeer chair.

This is the chair that i am going to turn into a chair that is in a few of Vermeer's paintings. I have done a few sketches of what the chair should look like when finished.

This picture of Girl asleep at the table c1657 is a back view of the chair.
I now need to work out how i am going to build this chair, i need to find the right green material for the back and the seat and the brass studs that are holding the material in place.
 The main problem is going to be making the lion heads that are at the top of the chair.