Thanks everyone for your comments. I have thought about access, and I think I will be okay. There is actually about an 18" gap between the back of the layout and the wall, so I will be able to walk around and access most of the hidden areas from the back. I am planning on building an access hatch at the center of the valley seen at the beginning of the video. There will also be one hidden track on the far side of the layout that will only be accessible by crawling under the table.
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