Thanks for the link, although I'm still a bit confused.
Which mesh needs to be at least 0.5 m thick...the actual mesh wall you want to see or the physics mesh you're uploading with it? If I still want thin walls can I keep the thickness of the mesh and resize the physics mesh to be more than 0.5m, since it's invisbl anyway...before uploading?
If I link say 4 walls together in blender that are all say 0.2m thick but overall make a structure that is 10x10m...will that solve the problem? Or will I just end up with one giant box around the whole structure? Do any of the walls, physics or actual mesh need to have enclosed walls or will 2 planes on opposite sides suffice?
I know that was a bunch of questions but thanks for the help
Also I did not know about the beta grid. How do I use that?