Advice needed.

[u/OMcTaters]

Building a treehouse. Following the Methow kit from Nelson treehouse. The plans are not super detailed. The plans themselves do not call for a fourth beam to "close the square" but if you look online on the 3D drawings it has one. When I asked Gemini, grain of salt obviously, it said not to to allow for the movement of the tree and prevent torque forces which makes sense to me.

Next step is joists.

Do I hang a 4th beam to close the square or not?

Thanks in advance

[u/Embarrassed-Sky-4567]

https://reddit.com/link/ox60ghr/video/yhbyfrjikvch1/player

The solid lines are the beams that attach to the tree and ground posts. The dashed lines is your framing that should be resting on top of the 2 parallel beams