Cat Pics

That's nice.

The "over enginerrer" in me would like to see them below the window level.
Most cats LOVE a good window seat.
Speaking of "over engineering", I'd also lower the curtains to below the lowered cat run.

...maybe that's why our cat friendly, yet escape proof back porch isn't finished yet.

It’s definitely not over engineered… I most likely will cut down the top step 2” and replace the 8” brackets with the 10” version for the top 2 stairs. It works fine, but the middle bracket has a slight lean downward and it bugs me and can’t be corrected without a horizontal support, which defeats the purpose of this style bracket/shelf combo.