My plans are to build a 8 x 12 (12’.6” offset) treehouse supported only by the host tree. I have a 50 inch wide metal subframe that’s long enough to extend 12’ 6” to one side of the tree and will extend to the backside of the tree and will box in the Metal frame around the main trunk 10 foot off the ground approximately 32 inches in diameter. I’m going to build my attachment points (TAB) out of axle shafts. Framing and floor material will be solid 2 x 4 & 2 x 6 dimensional Redwood lumber that has been re-purposed off of a deck. Will try to post diagram & photos. From my tree selection and my basic plan I know there’s several?’s would love your comments or input.