Super Cat Kitty Condos are made with cardboard and can be duplicated easily. (that's the only default i've found) Otherwise, this product is super neat and loved by many cats!!
The pieces easily connect and disconnect so you can remodel often, it's lightweight, and fits together to create play areas of any shape and size!
My cat enjoys his condo. There's a few levels with cut-out openings for windows, it's spacey AND the extra cardboard from the windows create round toys for the cats to play with.
I was quite impressed with the left over pieces.. when attached together it makes extra toys to bat around with.