Wall rails

The rail is used to attach the triangle assembled in the position of the ladders to the wall.

You can either attach one segment of the triangle to the rails behind the prepared holes in the sides. You can then change the position of the bottom of the triangle and "undermine" it away from the wall. This creates an inclined plane, turning into a vertical wall.

Or you can attach the triangle to the holes used for threading the locking screws and by moving in the rails change the angle of the inclined plane created from the ladders.