I am planning to convert my existing 2 car garage into a master bedroom with a sink, toilet, and shower. My current existing sink, toilet and shower are just on the other side of the interior facing garage wall. How can I mirror those fixtures... in other words add the same fixtures back to back in the garage. I am looking for alternatives to extend the plumbing without having to go into the slab foundation to tie into the city drains, if any alternatives exist. Thanks!