I think I could do one or the other especially in winter. Issue is ect noise so sucking it up through a cupboard is definitely possible.
I was wondering if it would better control my environment to just flow fresh air over the top of the tent above the lights. Aka have the In and out inline with each other high up. I use external filters and fans so it's just a duct hole
So if you bring humid air into the tent and exhaust it outside (which is what it sounds like you're doing now), then your tent is going to be humid no matter what. The dehumidifier(s) inside the tent will fill up, but the humidity in the tent won't go down because you're exhausting the dehumidified air out and replacing it with more humid air from the intake.
When people talk about a "lung room," that's basically the space that your intake is pulling air from (in a lot of cases the "lung room" is just the room the tent is in). You want the air coming into the tent to be less humid to begin with, which may require having a dehumidifier in the lung room.
You can also exhaust back into the lung room and the dehumidifier will remove the humidity that gets generated by the plants.
To address the noise, you can put the fans and filters inside the tent if there's room. Also, not sure if you're using an intake fan, but in a tent you can usually get away without one.
Hope some of that helps, good luck!