Thanks for the heads-up. I bought a Studor kit at Lowes last night, and the installation instructions have it coming right off of the s-trap. In fact, the kit comes with its own s-trap and shows a picture of the studor vent in-line, right after the trap.
Where is it "supposed" to go?
By the way, this is not going to be a permanent installation. I plan on making the whole drain system removable, in case we ever move. I just need a sanitary, enclosed method of draining off my excess wine fluids.