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After many different methods over several decades, I found one that suits me best, very recently. From making scenery, I had a number of pieces of 1" and 1 1/2" polystyrene foam [ pink and blue ]. I place my tunnel portal over the foam and trace around the profile with a marker. <br />The outline is cut with a small bandsaw, but a jigsaw with fine blade works ok too.Just trace and cut as many pieces as you need for the tunnel depth you're looking for.Cutting angled vertical slices off these pieces lets you go around curves. I just paint the inside with black acrylic craft paint.Glue the pieces together with white or yellow glue. Good luck and regards / Mike
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