I leave my camera in the housing inside in the case. There is a port "plug" in it (which has a whole in it, so no risk of a vacuum). I carry a second body in a backpack with my dive computers etc.
Regarding the camera being "shocked" if the case is dropped, I really can't see that being an issue. The Pelicans are really tough as are the housings. I suspect the plane could fly into the side of a mountain and the only "thing" to survive would be my camera! Seriously though, some Dufus once knocked my entire system off of an elevated bridge on a boat. The thing (Camera, 2 strobes, 8" dome) hit the carpeted deck about 6' below and the only thing the happened in the dome shade came off. It was easily reattached. This is not to say that I recommend doing this, but I think these things are tougher than we think.
I seem to recall a thread on here a year or so ago about the truly "stupidest" things that we've had happen to our systems. I mentioned by "bridge drop" but I think our beloved Vis'art mentioned that he put his system on the roof of his car and then drove away. I seem to recall that the resultant tumble down the trunk of his car onto the road resulted in some damage, but more to the strobes and arms, and the car itself, than it did to the camera and housing.