Something a bit more elaborate than this leading up to our moon living room window? I could tie it into the tree-house theme I'm thinking of doing. It could just look like a platform tree house at the top of the "tree".
Now THIS is a cat tree! The Catframe combines a contemporary wood cat tree, sisal rope scratching posts, cubby holes, soft pads for kneading and sleeping, and last but certainly not least – storage for all kitties toys and treats.