Base is 10 mm thick Eva foam

(Eva foam is used for gym mats and very often to make Cosplay props)

After I had done a small test layout with masking tape, I drew with a white marker. 

The road on the top is a 1 mm thick Eva foam, that I sanded down on the sides.

I masked the road and added flock grass to the lawn. After removal of the tape, I cut into the Eva foam to enhance the cement tiles + warm hairdry to open up the cracks. 

Painted with acrylics and made different washes out of the same.