So what does the plumber really need (besides a belt)? Rough in connections! He doesn't need connections on the bottom of a sink, or on the side of a urinal - all of that really does get worked out in the field...so how do you help these guys get into BIM?
There are two big things:
1 - Change the location of the connections to inside the wall (thank you Melania Sibley at Enfinity Engineering in Nashville, TN). She had a sink that was giving her fits - so we made a new family. All of the connectors sit 2" inside the wall. They are controlled by vertical and horizontal work planes - the water connections can be 4" or 8" apart, you pick - and the waste connection, centered, can be moved up and down vertically in the wall to the stub-out location. this maintains the system - and eliminates the need to draw out the p-trap, trap primer (call these out in a shared parameter for scheduling).
You now have my permission to whip your plumbers into shape...and get them BIM'ing...
See you at AU!