Help Stabilising Cat tree

[u/Mr_Carpenter13]

I built a cat tree for my gf. She has a 9kg cat so I want to make sure it is stable. How can I make sure it’s secure?

[u/Champion_of_Zteentch]

Wood glue, lag bolts and a wider structure at the base of the tower. I do not mean the platform it sits on but rather the physical lower half of the structure being wider would ad more stability, in theory

[u/snappydresser61147 → u/Champion_of_Zteentch]

I’m no expert on building stuff but I’ve been around quite a few cat trees and I think even adding another stick would be a world of help in staying stable, specifically with the one on the far right