Furhaven Steady Paws Multi-Step Pet Stairs for High Beds & Sofas - Gray, 4-Step

Hi - I'm looking for the depth of each step (not the distance between steps). If each step is 15.75" long, how deep/wide is each step? Thanks :)

Anyone know the distance between each step?

Is it possible to order extra “short” legs?

What is the base material under the carpet? Is it wood?