Tried a more difficult post in the general forum with no luck (http://www.terrylove.com/forums/show...for-sunken-tub). So I’ll try here with the second part of my venting question.

Which of the following venting layouts for a WC is permitted/recommended? Plan B requires a much longer horizontal vent so is less preferable from an installation point of view.

Plan A
……………………………f…………v…………………..
……………………………b………..ddddz……………
……………………………b………..……….z…………..
……………………………bbhhhhhhhhyyhhhhhhhh

Or

Plan B
………………………………….….v…………………
……………………………f……….ddddddddddv
……………………………b………..………………..v
……………………………bbhhhhhhhhhhhhcc
………………………………………………………….c

Where
f = WC flange
b = 3" 90 deg vertical to horizontal
h = 3" horizontal run sloped at 1/4 in/ft
d = 2" horizontal (dry) vent sloped at 1/4 in/ft
v = 2" vent vertical to roof
c = 3" medium 90 deg horizontal to vertical with 2”
y/z = 3"x3" Y fitting with 2" exit rotated ~60 deg rolled so that it is above the horizontal centerline of the drain connected to 2” 45 deg bend leading to a 2" horizontal dry vent