@User you are supposed to use most of the .gds files as is and not try to regenerate them with the current tools. The three steps when using OpenLane are: 1) generate user_proj_example.gds, 2) generate user_project_wrapper.gds (it uses the output of step 1), run "make ship" at the top level to have magic combine the various .gds files into a single layout (uses the output of step 2)