Sketchup - dynamic component - simple cube

I need a dynamic cube.
I need to be able to define the thickness of the material, currently 8cm+8cm it could be set to 4,4 or similar, it will always be perfectly square.
the same goes for the cube in total, it's currently 120cmx120cmx120 I need to be able to change this aswell, to e.g. 100x100x100 and so on

This is pretty basiv dynamic component stuff so please post a fair price. I need this cube ASAP.
The cube needs to contain the exact parts as in the file.
I just noticed that the cube contains a few reversed faces, please reverse those in the final cube.