Gather these parts for the full stone wall

Superglue the frame onto the painted core with the hooks lining up the top and bottom corners

Glue the interior plate onto the back side of the core lining up the top and bottom corners

Glue the support hook in place as shown

Gather these parts for the ruined stone wall (There are two different lengths but the process is the same)

Superglue the frame onto the core with hook making sure to line up the hook-side top and bottom corners

Glue the interior plate onto the back side of the core lining up the hook-side top and bottom corners. For the wider stone ruins, glue in the support hook to the center slot just like on the full wall.