Need Help Meshing Sheet Metal Using 3D Elements

I am trying to create a mesh of an engine hoist where the criteria strictly states that all elements used in the mesh must be 3-dimensional. This is a problem because when I create a mesh for the assembly the parts that used the sheet metal tools to be created mesh using only 2D elements. No I know you can convert from a solid body to sheet metal but is there anyway to do the reverse? Or would the part have to be remade as a solid part? Any help would be greatly appreciated.

Edit: Attached screenshot of issue area.