Like the plane face on the bottom, how do I pull it back to the mesh? If I just do so, the plane face at the front would go back along?
I’m not an expert but if I remember right the best way is to select all the edges you want to thicken/volumize and then extrude using the normal as a constraint. You may have to invert the normals to thicken your planes. Then you’ll need to select the faces that were the original and invert again. Hopefully someone that knows more than me will come by and help you.