Let me start out by thanking everyone for the wealth of knowledge you provide on this site. I have been reading on this site on and off for a couple of years and have gained a lot of plumbing knowledge that I would have otherwise not had.
I am currently designing a bathroom that I would like to put in my basement. I am located in Wisconsin and plan to pull a permit as soon as I have solidified the dwv plans. The following picture is looking toward the bathroom where there will eventually be a door. The green line shows the current 3" waste line. I have punched a hole in the concrete and confirmed the location of the waste line. It is located approximately 1.5 feet under the concrete so I have plenty of height to play with to get 1/4" drop per foot for all waste lines. I didn't model the 1/4" drop per foot but will be sure to include it when actually doing the plumbing. The thin purple line represents 3" pipe, the rest will be 2". The blue pipes are vents which will all tie together in the ceiling and connect to an exisiting 3" vent that runs directly to the roof. I will make sure to slope the vents back toward their respective waste lines in case of condensation, etc. The only san tee in the design is for the lavatory. I will make sure to use long 90's etc and combo Y - 1/8 bend for waste fittings. Sorry as I am not the best using Sketchup, I just wanted to make sure I put together a solid plan.
Front left - corner shower
Back left - corner tub
Front right - cabinet/lavatory
Back right - corner toilet/water closet
Here is a closer picture looking at the plumbing for the toilet and the lavatory. I am attempting to wet vent the toilt and the lavatory but am not really sure that I have done this correctly.
tub trap to vent - 3.5'
shower trap to vent - 12"
toilet flange top to san tee vent - 5.5' (I may be able to shorten this up some by moving the vent/waste line closer to the toilet but still inside the cabinet. I am not sure the exact length that this can be.)
I would really appreciate some feedback on this layout. If you need any additional pictures or information please let me know and I can provide them. Feel free to comment on simpler/better ways of doing this as I am a novice.