After work I managed to cut one door so I could see how the window fit was. Not the best pic but you can see how much I will need to widen the rear post to fill that gap back up.
I was also glad to see that the wing window did indeed still fit. As I expected, the top of it protrudes into the door so it won't be able to open. But with the weatherstrip installed you will never know it goes up that high in the door.
