Just a few thoughts that I would consider before expanding. A small cabin for vacation or temporary use would be good, but as you get older got to consider other factors. How would travel be for emergency care going down that mountain during inclement weather. Increment weather top of mountain on side of hill not best place to be. You will have to go up and down a mountain for groceries. Not to much growing of crops on a rock. Small cabin idea makes more logic you won't have much invested if you need to vacate or sell. Seen a few people in out of way places run into same situations and just thought I would mention these. Nice small cabin.