Ha ha! you kill me, wyatt!
You've officially done more hands-on work than I have with this project! I'm still stuck in my cubicle researching plumbing codes, since we don't know what we don't know at this point.
Our resident construction guy has constructed a mock-up for testing, though;
I think he's going to set the toilet today and plumb up the drain.
Today I've got to work up a Preliminary Report for the client, who is coming for a visit next week.