How to make a cam plate for a mechanical iris?

Hi there. I'm making a steampunk watch with a mechanical iris as the cover, inspired by gogglerman's "timeye".

I was wondering how you would make a cam plate for the iris, I have spoken to him and he has said that it is made of a brass sheet 6mm thick and he used an angle grinder. I was wondering if it is even possible to make one using handheld tools? I live on a small island where there ar'nt many hardware stores, let alone with the right tools, and i'm probably not even going to buy them anyway.

So any ideas on how to make a cam plate?

Look through the numerous instructables listed on the right hand side and see how they where made. You will see they can be made from most anything. I've seen them made out of cardboard. It all depends on what you want to use. The materials you use will determine the minimal tools needed to make the iris.