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David, > build a trap door on the backside of the mountain You can do almost anything... on my first cliff section the "floor" is sloped to a cave screened with screen door me***o allow water to drain from the track/ballast area. I would have built in accesses to the interior on the back side if I were not placing them up against the house. It would be easy during construction to run wiring or plumbing inside the mountain, rock, tunnel or what have you. Even afterwards you can drill and cut through the relatively thin surface to retrofit whatever you need, then just patch and paint. Best, TJ
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