You can find a "Cat Condo"( 2 story kind) PVC thingy at Wal for like $14, it has all the stuff you would need..... small PVC pipe and joints and some water resistant fabric........ Excuse the dirty pic..... Sebastian my handicapped Sebbi , (from lead poisoning.) - makes quite a mess moving his feet around. He is currently being upgraded to a bigger chair sling w/o the top bar. He's had this one for a few months when I first was experimenting on how to rigg one... Since I've put him in the chair he has gotten better use of his legs and is building strength in them. If I put him on the ground he can lift himself up on his hocks and scoot around some... He is much happier now. I'll get a better pic.