I think the skylight corridor is inside one of greebly pits we see on the secondary hull. Note the blue strips, possibly skylights to corridors. Also explains the weird tech pieces we see outside the window as part of the surrounding greebles inside the pit itself. That's the best location candidate as far as I can tell. I highly doubt it's in one of the spokes because those corridors are much wider than standard, and also have windows in the walls too, which aren't seen in the corridor from the trailer.