Thinking about the layout overnight, I wondered what the rocky outcrop would look like. A quick Google revealed that the limestone in the Cheddar region of the Mendips, where Steve's fictional quarry is set, dips by 20 degrees to the South East. Hence the layers of polystyrene on the face into which the tunnel portal will be set. There's a lot of plaster to be applied yet, but we think the result will work okay.
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