if you read my build thread it has several pictures of my work.
http://www.405th.com/f21/odst-veronica-dare-foam-freebuild-42024/ I will get more pictures of my forearms posted tomorrow, with more information.
When you get to the pictures of my breast plate that are mostly done, you will see green color, that is the different detail foam. It is 2 mm thick. I buy the foam at Hobby Lobby. It is called craft foam.