I'm thinking of putting up a sink with semi pedestal and hiding the copper water pipes and plastic waste pipe. The wall is an old style partition wall(between bathroom and bedroom) where the bricks are built resting on their sides therefore about 3in thick + plaster. I will probably dot/dab eventually then tile over. Will it be possible to hide the waste pipe in this wall? I presume i will end up chiselling or even taking out a section of full brickwork