The following are a couple shots of the steps I built last week for our aging Abyssinian cat. The construction is of 1/2" plywood from HD, the leg is split 2/4 with luan 1/4" covering. The legs are attached to the riser and stringer under the stop step with 2 backer blocks to resist movement should the glue want to give. The treads are 8" deep, and the risers are 7" high, the width of the steps is 11". This was my first attempt to cover anything with carpet, and I must admit to a "just barely acceptable" job.
Picture police take note