Love this tree house. I'd make some changes though since surprise trees grow. I'd have it on posts then add a wrap around porch built around the trees with space for the trees to grow.
This is amazingly close to the tree fort I built in the woods near my home in Fairbanks, Alaska at the age of 11. Lashing logs to trees, building a base and walls/roof. #boyscouts means I'll always #beprepared