For each of the towers, gather these 4 walls. Not the direction (up or down) on the slots on the side of each wall.
Slot together 2 of the walls with opposite slot directions
Add a third wall slotting in place as shown
Slot the final wall in place
Locate the 4 corner braces.
Glue the corner braces into the slots on each corner of the tower wall as shown above.
Locate the top
Glue the top on with the barricades sticking up through the slots in the top.
Gather 9 wall studs
Glue the wall studs into the slots in the barricades on top.
Prime with Rust-o-leum Profesional Enamel flat black and paint as normal with hobby paints.