A 3x5 would be great it is actually larger than a 2x6. Part of my cage is a 3x4. I don't have a pic of only the 3x4 part but here is a pic of the whole thing, the bottom part with the Scooby Doo fleece is the 3x4
http://www.guineapigcages.com/photos...61/ppuser/6820