@Vectis Hamstery - That's a good idea, haven't thought of that yet! I'll give it a go, thank you!
@Serendipity7000 - Here are some images of the cage!
http://i63.tinypic.com/34ytkw8.jpg
http://i68.tinypic.com/x3setw.jpg
http://i63.tinypic.com/uq16t.jpg
The second floor is a bit crooked as I put the level down 2 bars on one side and 1 bar on the other side so it didn't hit the wheel but I'm going to revise this soon.