making a base at the oak tree, anchoring to the tree not working

[stevej018]

tried following a youtube video and its not working like shown. how it looks on my side is below
https://steamcommunity.com/sharedfiles/filedetails/?id=3323505000

where do you guys build your base, I hear the mushrooms are good foundations, but the only one i see is up high

[Max Rainwell]

The whole base is around the oak tree, the stairs are not attached to it.
https://steamcommunity.com/sharedfiles/filedetails/?id=3323577463
https://steamcommunity.com/sharedfiles/filedetails/?id=3323577405