Back when I posted this, we had only put one shelf up.
The area by the windows was easily accessed by the cat tree. The shelved area on the wall with the clock is supposed to be most accessible from the railing at the top of the stairs. They hop across the two large shelves at the corner, from one area to the other.
Bubba doesn’t go over the Contempocat stairs much. He doesn’t like the smaller steps and the wide ones are just barely big enough for him to turn around on. He’s free to do what he wants, which sometimes it’s as simple as wanting to stay laying down on the top landing of his cat tree.