Looking good! Would suggest you put it on stilts, or a platform, with a ramp. Also a window or two in the back and sides. cats like to be up high, and like to be able to see around them. Just a couple of inch or so holes, would suffice. If you brush her, put some of her hair in the cabin also, so she will feel comfortable in there. A little catnip, would help also. Nice cabin, and stop using the cat as an excuse to revisit your childhood.
Good job, and a kind gesture for an abandoned pet. You could put the cabin on a piece of plywood, and put a front porch on the cabin, and use the plywood base, as a place to put her food and water.
Wayne