Building a layout to a deadline means progressing multiple tasks in parallel. While working through the painting of the buildings I've been adding terrain to the baseboard. As usual this uses expanded polystyrene foam from my stash in the garage, saved from packaging over the years - especially if it's a flat sheet since that makes it easier to build up contours.
It's less messy to slice the foam with a sharp knife than carve it with a serrated one. The constrained space against the backscene meant it was easier to make the first cuts off the baseboard, having marked out the approximate shape with a sharpie, then trial fit and trim until the right general shape is achieved. The foam layers are then glued down/together with PVA (yes I know it shouldn't work on foam but it does!) and once dry, final slicing achieves the landscape shape that fits the space and looks right.
The foam is sealed with a couple of layers of kitchen towel fixed and soaked with more PVA glue. Once dry (it takes a while) this forms a surprisingly tough but flexible surface, which helps when fixing trees and fence posts (holes in the foam alone would open up).
Normally I'd mix up some brown coloured tile grout and apply a thin layer, which smooths and can be used to form minor changes in surface shape. However, here I was happy with the shape of the foam and the surface was pretty smooth, so I tried a quicker and possibly less messy technique I'd used on a diorama before, A mix of PVA and acrylic paint was painted thickly over the surface...
...the dry tile grout was then sprinkled onto the wet surface through a tea strainer. Tapping the teaspoon against the strainer causes an even distributed flow of powder. This didn't coat as evenly as I'd hoped, so I sprayed water over the surface and applied another layer of grout powder. Excess was then vacuumed up. I'm not sure if it was really much quicker or easier than spreading wet grout, but the result is a nice even soil texture.
There was some brown paint/PVA mix left over so I put a couple of coats on the pond, which will be sanded smooth then painted - er - pond colour.
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