FGBuildable Walkway Lightweight, same as vanilla catwalks. By default there's un-editable BuildingMeshProxy (FGColored Instance Mesh) component inherited from C++, so i added another FGColored Instance Mesh and that's where i put my mesh. Collision Presets to be BuildingMesh as vanilla catwalks have that. I tried enabling the checkbox Trace Complex on Move in my mesh component, but that didn't help.