I've taken a plastic box and cut away some of the long side I saved 8 cm in screwed a perch and two food bowls.
Foot for climbing trees.
I have a bottom section from an old office chair and a? I think the English name is twister? I drilled holes in theTwister and pulled down the tree and screwed it with 3 angle brackets. It is easy to move around and to clean.
twister a winter toy.
No more shit in the water bowl. I used a sodastream bottle that is a little thicker than regular soda bottles It is easy to make and easy to clean.