I'll give you some raw footage, if you want. What you edit would not be considered the official final cut, because that already exists. But if you wanna do it just for practice...
There's also fake trailers. I've become convinced that mashing up some fake trailers is a good way for an editor to get good practice, and hopefully gain an audience. For what it's worth, this is one of the next projects on my near-future to-do list.