These look really amazing. Free Spirit Spheres has commenced limited production of the 3.2 metre fibreglass sphere tree houses and now has sphere shells and kits available for the DIY market. Orders are now also being taken for the wooden shells and component kits and fully-finished made-to-order wooden Free Spirit Spheres. Shells can also be rented for the night (if you’re in Canada). Link.
Spherical wooden tree houses