Hello. I am preparing to rough in a new master bath, and I am hoping you can give me some advice. First off, I am a very experienced remodeler and have installed tubs, showers, toilets,etc. but I always use the existing plumbing or only have to slightly modify it. This is a completely new addition, so I want to make sure I get it right. I will have a tub, shower, toilet and lav in this new bath. All of the DWV will run to the home's main stack about 20 feet away. Since there is a basement, I will have no problems achieving the 1/4" per foot drop required. I am planning on running 3" pvc for the connection between the new bath and the main stack. My question is related to placement of the fixtures and venting. As it stands now, the 3" run will have the following fixtures tying into it in this order: tub, toilet, shower then lav. Is that ok? Also, is it okay to only have one 2" vent that comes off of this 3" pipe? My thought was to have the 2" vent fall about 2' from the toilet and loop all the way to the main vent stack (about 20' again). Does this sound like a reasonable plan? If not, can you give me some suggestions? Thanks in advance!