In this topic I would like to share how I make the basis for model.
I'll start with the final cut and painted plank :

Now assemble the grid to connect plasterboard, in order to enhance the adhesion of glue:

Paper tape mask the edge of the stand:

To forming grounds I use glue for bonding Styrofoam facade panels (glue prepare by adding water into it

)

The formation of the land (no need to rush, glue dries long):

Take off the mask and wait for until completely dry:

The next steps are, painting, planting grass and execution of trees and shrubs
To be continued....