The mountain is shaping up nicely. For tunnel liners, I used scraps of blue Styrofoam and temporarily put strips of black duct tape I had for another project. It's too shiny that is for sure, but better than open spaces. For a permanent solution, I have thought of the crinkled foil, also, I have thought of putting in a carved plaster wall near the portals to represent the same stone the portals would be made of. Kind of Pennsy style cut stone look.
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