How to deform a mesh from inside the cube?

Hello together, I need your help, I couldnt find a solution yet, but I have to admit that I really have slightly an idea about how unity works..

The goal is to have the camera in a cube sphere and to deform the Material from inside the cube with MousePosition.

For now I used a mesh-transformer-package, which is able to deform the cube with mouse-position, and one script, which flips the normals, so that the texture of the cube is visible from inside the cube. Each alone does work, but not together. Is there a way to combine those two attributes?

Pleeeease help me, i'm getting frustrated right now..