We're not talking about pulling random vacuum lines. We're talking about teeing into an existing high quality line that won't be impacted by a tee. Sure there is a tiny bit more air in the line, which means that there will be a milisecond more delay in creating vacuum in the brake booster while the vacuum to the BOV is also created. I'm not worried about a milisecond. There will be no actual pressure drop in the lines as it is essentially a closed system with a vacuum (or pump if in boost) on one end.
As for the diagram, it's a great schematic with a bunch of straight lines. But so what? Knowing what to actually look for (i.e. what the brake booster looks like and where it's located) for someone who's not a mechanic is where clear pictures, and a solid description comes in. KyRaceFan, in my fantasy world, we're all here to offer assistance in areas we know and ask questions in areas we don't. I'd hope that we're not here just to repeat someone else's comment pointing to a mostly useless schmatic and offer other useless comments.