To reliably attach scale people to a layout, start with their feet. Using a superfine fingernail polishing stick, very gently sand the bottoms of the shoes until you see nice clean, flat patches of white styrene. Next, apply a tiny dab of thick CA (I use Gorilla Superglue) to a scrap of styrene and, holding the figure in a pair of fine tweezers, lightly dip their feet in the glue; then position the figure on the layout—preferably on a relatively smooth, flat surface. [ ... ]

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It's said that people who live with a pet being to look like each other. I wonder if it's true with layouts?

After a little advice with where to start, [ ... ]

Scratch building is defined in Wikipedia as “The process of building a scale model "from scratch", ie. from raw materials, rather than building it from [ ... ]