Got the package earlier today, and have been thinking it over. How much should I be doing, and are we doing the sections in order? I didn't think that particular franchise crossed the Pond much - but a system combining cards and dice seems appropriate.
Games of imagination are never truly done. Yet tomorrow we shall start another one.
As far as I understand, there are no restrictions. You can do any part, in any order - system, setting, fluff, art. The same goes for the amount of changes. What you see now was created by three people before you (Rob, me, maledictus). Rob gave me a story seed, a very basic game setting, which I tried to move into a direction by adding two paragraphs. My guideline was that I wanted to make a contribution, but keep open spaces for the other collaborators to fill in with their own ideas.