Gather these parts (each crate may will have slightly different dimensions)
Slot sides together as shown with engraved detail on the outside
Slot the other two sides together as shown
Superglue the bottom onto the outer frame
Superglue the top on as shown if desired. Leave the top off if you want to fill with your own contents.
Prime with Rust-o-leum Profesional Enamel flat black and paint as normal with hobby paints.