Gather these parts. The sizes may vary based on the side of the block, but each will have a top, 4 sides, 4 corner strips, and 4 corner base brackets
Stat by gluing one side into the top as shown. Make sure it’s as close to a 90 degree angle as possible
Glue in an adjacent side
Glue in a corner strip as shown
Clue the base corner brace in place as shown
Continue with the rest of the sides and corners
Prime with Rust-o-leum Profesional Enamel flat black and paint as normal with hobby paints.