Here are some rough sketches I started when this idea broke into my mind.
This one shows a sky view of what I'm wanting, the red is the main floorspace.
The arrow indicates that the distance from the wall that sits on the tree to the wall that faces outside is 6 feet. I figured that was good seeing as its my arm-span. I'm wanting it to extend 9 feet around the tree (also the red area)
This one shows what I am wanting it to look like from the outside. (Working from roof to ground)
I want the roof to be angled by about 40* to keep from rain or snow collapsing it in.
The main walls I was either going to make only two feet up and the last 5 feet being walls that can move up so that sunlight can come in. Or just make plain walls and cut windows into them. Like I said 7 feet tall to allow even taller people in.
And two sections of floor supporting beams; a short inner section that will connect to the tree and a outer longer section that will extend to the ground.