I just thought this was nifty and went ahead an tried it! While looking for large but cheap bunny cages for my daughter's 2 Holland Lops, I ran across what is called "C&C cages".. Its normally built for Guinea Pigs but I also found some for bunnies too and thought that would be perfect for my Serama also!! so anyways if you look up prices I found Target has some for $20 that is just 4 cubes which is actually perfect for bunnie cages.. BUT I found them at Kmart also for $20 that is 6 shelves! Basically all you do it use Zipties and tie the pannels together and make a bottom an running boards to keep the bedding in! 3 nice sized cages only cost me $40!! The rest of the stuff (wood & Zip ties) were freebie scraps!! In the Serama pen I have 1 rooster with 4 girls with room for a few more in with him!! Dominic saying "LET ME OUT!!"