I'm renovating a bathroom and would like to put one in. The walls are lath and plaster, but I can fit a bit of 2 by 4 to provie adequate support, so I'm wondering if I can wall mountany sink OR if I need to specifically buy a wall mounted on. Also, I can run the hot & cold supplies easily, but wonder if the 40mm waste is hard to run inside the stud wall. Does thi tend to be tricky?