Glue back plate on so that the hooks protrude throguh the slots
Glue the first frame plate on top of the middle plate so that the edges line up
Glue lights into the slots between the doors
Glue the top frame plate on top slotting the lights through the holes between the door frames. And glue the handles into the slots at the bottoms of the doors
You’re all done!
Prime with Rust-o-leum Profesional Enamel flat black and paint as normal with hobby paints.