[Optional item] What are the material, dimensions, and mass of the ground plane (03-00007A)?

The material is aluminum, and the dimensions and mass are as follows.

Dimensions: (W) 1800 × (D) 1000 × (t) 1.5mm

Mass: Approx. 7.2kg (1 sheet) * 03-00007A is supplied as a set of 3 sheets