Stacked a kallax 2x4 & 3x4 on top of a 5x5. But now I'm having doubts. It's mounted to the (very old) brick wall, as shown in the picture. Do you think
Stacking Kallax? | BoardGameGeek
An IKEA Hack of Epic Heights: A Sky-High Stacked Bookcase from KALLAX Shelves | Apartment Therapy