What a handsome boy! Just a question, if he were to fall from the ledge and fall on his back could he right himself on that slate? It looks pretty smooth to me. :s
I would be a little concerned too, with the bridge thing. Although, it looks like he wouldn't be able to climb it anyway. I would keep an eye on that. Otherwise, very cute little guy.
He can climb it but mostly just lies on the bottom of it, when he does get to the top he don't go anywhere near the edge, there is bowls and stuff normally there but I'd just moved them for the photo.