and here is an updated notebooks with a working version of the flow: https://colab.research.google.com/gist/proppy/3966425c1eb12c0271e1f4413ae392a6/gf180mcu-openlane-playground.ipynb (currently reverting OpenROAD to

0_4941_gdc11f5970

because of https://github.com/The-OpenROAD-Project/OpenLane/issues/1387)