I would like to make two baths out of one large bath. The upstairs bath has a tub on one end and shower on the other. We would need to make the sink into two and add one toilet. A wall would go up between the two toilets. This bath is on the second floor where all the bedrooms are. There are two entry doors. It is above the kitchen and on an exterior wall. We have a septic tank system. On the main floor, next to the kitchen is a small bath with shower. I would like to remove the shower and keep the sink and toilet there. My questions are, is this a project that can be done; How would we soundproof each bath and approximately what kind of cost am I looking at (the plumbing only as we are pretty handy). Thanks!