Gather these parts
There are a few variations of these parts on each sheet. Let's start with the double "X" sheets first
Slide the three cross-members onto one of the wall segments as shown above.
Slide the other wall segment into the slots on the other side of the three cross members. Make sure that the details are facing out on both sides.
Glue the base and top onto the assembly from the previous step.
Gather these parts for each of the X's. For this wall piece you'll have 4 (2 on each side)
Glue one of the ribbed pieces into each of the arms of the "X". Be careful not to come in at an angle or you may accidentally drop the piece into the cavity in the middle of the wall.
Glue the center of each "X" in place.
Glue the corners into each of the X's
One of the other variations has a wall grate in one panel. Assemble all of the rest of the wall in the same way as the first Double "X" type up to this point.
Find these parts for each of your wall grates.
Glue the grate onto the circle in the wall panel.
Glue the rivet ring onto the grate from the previous step.
The last variation has a hatch in one panel. Assemble all of the rest of the wall in the same way as the first Double "X" type up to this point.
Find this part for each of your wall hatches.
Glue the hatch onto the outline in the wall panel.
Prime with Rust-o-leum Profesional Enamel flat black and paint as normal with hobby paints.