Create a Custom Token/Figurine question

Hi everyone, I need some advice from someone with more experience than me.
I’m trying to create a sort of Figurine in my game: a 3d card so imagining it as a 2d playing card but with a thickness
I created a mesh of a flattened cube, from here… I thought of applying the paper texture on the front and back and cutting the transparency through the material…
Good. My problem is that the thickness of the mesh should be refilled… I hope to make my problem clear through images.

  1. This is the material that cuts the transparency of the texture based on the character.

  2. This is the mesh representation
    A simple flattened cube is customized with margins.
    The texture is applied on the front and back based on the uv map
    Screenshot (131)

  3. Here is how my actor looks. So what I can’t figure out is how to handle the thickness filling (applying the texture would make it look like a frame, like a cube)