Four separate pieces make up this wall set, which means the layout follows the room instead of the room accommodating a tower. The kit includes a 19 by 13.5 by 6.5 inch hammock, a 16.5 by 8.5 by 3 inch three-step stair, a 13.5 by 11.5 by 9.5 inch single platform and a 25 by 22 by 10 inch two-step cat tree, so a climbing route can run along one wall or wrap a corner. Sisal covers the stair treads for grip during a fast climb and doubles as a scratching surface. Plywood forms the structure with carpet and faux linen fabric on the resting surfaces, and each layer carries up to 22 lbs. Mounting to studs lifts the whole arrangement off the floor, recovering the square footage a freestanding tower would occupy in a small apartment. The complete set weighs 13.5 lbs. Mounting hardware ships with the set, and the two-step tree spans 25 by 22 inches. Each piece installs independently, so the layout can grow one shelf at a time.