The second layer of foam was cut in order to embed the stairs.
Here is a close up of a wooden dowel used to mark the foam board.
No more nail cement glue was used to fix the foams together.
See the wooden dowels under the building.
The marks left by the wooden dowels will later be useful to know where to drill the wooden base to fix the building on the base.
Wooden dowels were installed under the building to punch the foam board.
Elastics were used to hold pressure on textured plastic sheets covering the stairs.