Show volume and workings for shape in SketchUp

I have a shape in Sketchup with volume of circa 49m3. I need to show workings for how the shape is 49m3 volume. This will be done by breaking it down into regular shapes (prisms, etc,) and showing the workings for the several regular shapes that make up the entire shape.
I will share the .skp file.
I started to break down the shape into smaller components (see 2nd attachment) and can see this will be possible to do but I don't have enough time to do myself right now.
I imagine the shape can be split in half and then broken down into approx. 9 parts. Workings for calculating the volume of each of these parts must be shown (either in .skp or something else) to show the total volume.
Let em know if able to assist