I'm in the process of plumbing in on a bathroom remodel and was wondering if what I was planning on doing would work or not..My drain/vent line is in the exact (inside)corner of the room. I'd like to hug the wall and install the 3" pvc in a straight line, to do this I would have to use a sweep 90 at the end(horizontally) and then about a short piece of pipe with a sweep 90 vertically for the toilet rough in. Is this ok to do? I'm also wondering about the venting..it's an added in bathroom that had a bathtub, toilet and sink, all hooked to a single vent, is this still ok? I was thinking about using an AAV under the vanity as it's furthest from the vent line.