Ka_kamakshy interior architect ,
Did you check with your contractor why he thinks it will fall down. May be he hasn't done it earlier or he doesnt want to do it.
It is very much feasible to clad the walls with marble/granite/ other finishes.
How will I beautify my bedroom more.what colour of curtains will I use
How should I bring some life and spunk in this room?
Need help as to how to put mirror on the bathroom wall
how to design this wall