Home Tree was inspired from the tree in the movie Avatar, and all blocks were placed one at a time.

The trunk has seven floors with stairs all the way to the roof that is covered under the twelve canopy rooms. 

The way in is there is a little pool of water next to the tree, that you have go under water to a tunnel that lets you walk up stairs in one of the roots.

All of the limbs are stairways to the outermost part of the canopy, and everything in the canopy is separate rooms.

I mainly used these three pictures from the books and movies to figure out what parts would work together to achieve my main goal: Give the tree as much usable area as possible while not looking like a box.

The limbs are shaped the way they are, because I felt it would be best for creating the stairwells in the limbs allowing the player to have access to different areas of the canopy without having all of the canopy attached like a web. Also I felt having the canopy this way gives as much useful and protected area as possible without sacrificing all of the looks... 

The size is what I believe to be proportionate to Home Tree in the movie in the jungle. 

I pictured the tree to be like an elven village entirely inside the tree where multiple NPCs could be put. I did not make the tree too easy navigable, because during the movie it was easy to lose sense of direction and where you were in the canopy. I wanted whoever used the tree to have the same sensation. 

I am interested in the diffrent ways people will design the inside of the tree. This is not done yet, and why I feel it is only 75% complete. Please share what you do with me.