I baked this project in Rhino, but can someone do it in grasshopper with joints? (for manufacturing it)
Also horizontal walls should be longer than vertical so I can connect them as a puzzle, how to make it in grasshopper?
So the result should be baked with detailed joints.
There are a lot of factors here. You will get more responses by isolating a condition and working though that case.
In corner joints it would be helpful to identify the variables that you want to control; Panel Thickness, Overlap size, various constraints. If those aren’t clarified we can only guess.