I am trying to get an attic prepped for a later remodel. This project is not on the front burner now, but I want to have the plumbing ready to go when I'm ready to finish, as it will go through walls below, and I may have to tear into some walls to accomplish this. Anyhow, I wish to install a toilet, sink, and bathtub in the upstairs bathroom. I have 10" joists up there. I already have the main vent stack coming up in the area, which is the old iron pipe and I want to replace this with PVC anyway. The lower toilet feeds into this in the crawl space. I plan on putting the new toilet close to the stack, as I don't want to run 3" pipe through any of the joists. The problem comes with fitting all the plumbing within the joist height. If I only had a toilet, it would be easy as it could use a 45 to connect within the space, but I'll have to use a 3" T with a 2" inlet or two or similar fitting to connect everything. I think I might be able to get part of that fitting a little bit down in the wall to clear some space, but I'm not sure if I can get everything in there right and achieve the right slope as well. Any suggestions?