I am in the process off remodeling a bathroom and am converting what was a single vanity to a double. While I am not a plumber, I usually know enough to get by with a little here and there when it’s not worth calling one in on my projects. However figuring out how to properly drain and vent this one has me a bit stumped and I’m looking for ideas. I am not concerned about it passing inspection(no permit) I just want it to work properly. As you can see in the picture I am tying into galvanized pipe, not only with the drain but with the water lines as well. With the way I have it now I am unable to bring a vent back over to the stack mostly due to lack of room-(circled in red) the galvanized water lines go all the way up and don’t really allow enough room for 1 1/2” to make it thru the studs above my drain line and below is an outlet that takes also up too much space. The only places there is room for 1 1/2” ABS is where I have it running now below the outlet along the bottom plate. Also, this is in a basement-so concrete floors. Other than running the pipe as I have drawn in blue(which I don’t think works because of flood rim level) the only other idea I have is putting an AAV on at least the trap on the left if not both. Any ideas or advice is appreciated, thanks.