You're on the right track to passive air intakes but basically instead of worrying about how to become a rocket scientist and calculating your pressure, just take a single 2 ply piece of toilet paper and place it over your passive air intake, if it holds itself there just enough to where it doesnt fall, you're doing good/your intake and exhaust are working near perfectly. If it falls off, your intake sucks/it's too big/you need a bigger fan. If it gets sucked in, your intake isn't big enough/your fan is too powerful for your intake size. A toilet paper piece might not be large enough if your passive intake is huge, but you get the concept. Apply however necessary.
So it appears even though there is little space in between the wall and tent that I have good air intake into the tent passively. I guess I will have to go with the last suggestion, I'm just not sure if I will run it directly into the tent. I'm not sure yet...Here are some updated pictures.