Dovecote, below, with a few adjustments I see something different.
Slightly larger, deeper, and sited at about 8', with a chicken coop ladder. Voila. A perch for cats.
Pic, above, here.
I can see my youngest, Laura, loving this. She was conceived/born in my previous garden. Her parents left by neighbors who moved away.
Until it's made, a long while from today, it's just another thing on the list, I get to decide if it goes onto the house, my conservatory or the coop. Maybe by the time the carpenter is called, I'll have convinced myself I 'need' 3 !
Garden & Be Well, XO T