We can't get coroplast here in Nanjing - despite it being made in China. We did manage to get the wire cubes though. So we've used a rubber backed pic-nic rug and sewn buttons on to attatch it to the cage. The ramp is a laundry scrubbing board, the toys plumbing pipes, a mcadonalds free plastic mirror on a key ring and a child's stool, and the upper tray a cut and splice job on some plastic trays.