Structural/honeycomb cardboard sheets 25mm thick (Mayfield EH9)

Box made of 6 sheets of structural/honeycomb cardboard. This is hard/unbendable cardboard that feels more like a piece of wood than the cardboard used in normal boxes. The sheets are taped together and can be cut apart to be separated. If separated the sheets are the following dimensions:

2 x 120cm x 63cm x 2.5cm
2 x 120cm x 10cm x 2.5cm
2 x 15cm x 63cm x 2.5cm

As they are currently taped together the box dimension is 125cm x 63cm x 15cm. I have left the sheets taped together but we can separate the sheets at my flat if you need to do so for transport.