"I made this house for my cat, Olive. She enters through a door in the bottom side and then ascends a ramp, which boosts her to the upper level. The front wall is plexi-glass, the floor is 2.5 inch thick old sheepskin rug, and my wife made some small paintings that hang on the walls. There is also a big cardboard scratching porch. Cats love to scratch and relax on cardboard. The top is removable and the glass slides out for maintenance"
See lots of pet related DIY's, scratchers and beds in the archives.