Installation of plastic cube for indoor playground

The position of the cube should be adjusted according to design. There are several situations:

1.Only cube: Let the eadge of the entrance hole align to the pillar, easier to enter.

2.Cube connect to tunnel: install panel to pillars, install tunnel to panel, connect cube to tunel.

3.Cube with a gate panel: install panel to pillars, then connect cube to gate panel.

How to fixed cube to frame after position confirmed?

Adjust position of two horizontal pipes under the plastic cube, about 30cm distance from pipe at side. Put cube on them, drill holes on cube and those two pipes, total 4 holes. Bolts cube to those two pipes.