Is it possible to choose more than one role? For example, both Engineer and Artist are things I would love to do, and I'd like a real challenge, but could you do both? Cause I can imagine the schedules overlapping quite a bit.

You are unfortunately only able to choose one role. BUT, you're always welcome to join other classes, if they fit your schedule. But, those credits will not be transferable, unfortunately.

Although, you can always focus on these things in your second year, where specialisation is the main point.