Maybe if you infused the pumice with various metals it would increase the structural rigidity of the cabinet allowing it to withstand the torque that is applied. I suggest various metals as I think that light show produced by the cabinets conductivity could be quite interesting and maybe even have multi-colored sparks...what could be better? It would be like the 4th of July every night in your listening room.
You would probably want to listen from a safe distance though.
You would probably want to listen from a safe distance though.