Not bad. Could do with being a bit more rounded though.
Make the arena from static meshes. Cut out an empty room, make one section of the roller arena (a half, quarter, whatever!) and copy & rotate it. Looks better, plays smoother!
To mark out the Red and Blue sides, use signs on the glass (or in it

) and some markings on the floor rather than round the edges.
Also, I personally feel the center should be more like the original in the film. The ball could spawn inside the commentators box (not sure it should be called a box seeing as it was round!) with the only way in at the sides (on the half-way line, not facing the goals). The Center players would spawn either at the bottom of a ladder leading up into the box or inside it.
I think there was only a low barrier between the arena and the center but it would probably be better if it had a glass/fence on top of it making a decent height barrier so that people would not just run through the center to the other side. You could make the entrance to the center also on the halfway lines.
See diagram for a better idea of what I mean...
