With the major project, you simply do whatever the hell you want. Write 2500 words on a subject, include a synopsis, an examination of 3 sources you used and a bibliography and you got yourself the major project. This major project is the only non-exam assessment task you get and from my knowledge it is worth 40%.
While there are a few restrictions on what you can do your project on, generally you can do anything. I did mine on the Samurai, and my friend did his on the history of Coke.
I am assuming you are in year 11 and you are considering doing extension history, Tenille?