We have taken out the tub and are putting in a tiled shower. Need some pointers on how to install a niche between the studs. We were told it was best to wait until the tiling is done up to the bottom of where we want the niche located, so it would look good and not require tile cutting. We will need to put in some support pieces between the studs, but it is a problem to do it through a hole in the concrete board! Any suggestions for how to accomplish this would be much appreciated.