I've just bought a Big Shot from a friend of a friend. I have a Cuttlebug which I am very happy with but it seemed like a good opportunity to pick up a BS. It's an old Ellison design teal coloured one. It has come with 2 white plates which look like the equivalent of the CB 'A' plate. 1 is roughly the same size as the CB 'A' plate and one looks like it's the equivalent plate for long thin dies. Will my CB 'B' & 'C' plates work with this machine? Are plates available to buy separately? What is a multi-purpose platform? In the past I've seen BS demos where they've used a sort of folder with different plates and they flipped the plates according to the thickness of the die. Is this what I need?