I received a real nice PM from Erik in Stockholm, inquiring about the strength of the EKET cubes. He said he had bought one, and was concerned about its’ structural strength; he was worried the cube would collapse on him. A justifiable concern! I told Erik I had assembled nine of the 4-cubicle EKETs, and stacked them three high and three wide.
IKEA offers a little packet of brackets to secure one EKET to another (on their back sides), and I have done just that to each stack of three. Each stack is on its’ own optional 4" stand, which has legs fitted with adjustable feet. I made the front two feet on each pedestal a little longer than the two in the back, so as to get the stack to lean back just slightly. Positioned correctly, the top back edge of the top EKET rests against the wall, and the stack becomes very stable. Pushing on the front or side of the stack produces absolutely no movement---it feels like it’s part of the rooms’ structure!
Erik suggested I post this update, so here ’tis.