I have left out roofing in hopes that MC will come out with an isometric camera view option in the future. That would match the orig game quite a bit better in terms of exploration. My guess is though that if they did, it would be similar to the views now where if something is in the way, it would block the view totally. It would be ideal to have a clipping level where you remove blocks from view or turn them transparent for easy player viewing. Don't to walk into a building with the view on and then only see the roof!