DIY Sugar Glider / Flying Squirrel enclosure
DIY Project: Make your own Rabbit Playpen, Fort, or even cage out of PVC pipe.
Double Decker More
Click the image to open in full size.
Cat Shelves- everybody needs a cat shelf!
Terrarium underneath the stairs. Wow that is cool. I'd do an aquarium instead and have a stair lift up to feed the fish :)
IKEA hack: Reclaimed Wood and Gilded Shelves