I recently purchased an old church that I am converting to a home. It has minimal plumbing and I am trying to design the new waste system. Its in a very small town that doesn't require any permits for plumbing,electrical, or really anything unless you change the footprint of the building. I am doing most of the work myself and want to stick to code as much as possible. After looking over the venting methods in the irc code book and numerous google searches I came up with a crude drawing of what I would like to do. I am looking for any suggestions or obvious problems with this design.