There is a quicker way:
I can import svg, convert all panels to meshes and then join all vertices to make single plane with panels divided by the edges. Then I can rotate faces, get the final box and then just add a solidify. But the problem is that with solidify I cannot get proper thickness topology, I need all panels to have same thickness and I want to have round bevels on sides.
Here is an example
Mockup2.blend (Blender 4.2.13 LTS)
