Build a catwalk for your household felines! Measure the length needed for each catwalk platform, cut the wood boards and paint the wood. Locate the studs in your walls and install the catwalk boards as shelves over door frames, utilizing the wall studs. Build a cat staircase up to the catwalk and use segments of stairs to add variety to the overall design. Consider enclosing the catwalk with wire shelves or adding a wall hammock at a dead end.