Sunk in roof

This is kind of hard to explain, so I found a video that will make it easier to understand.
In this video, he starts off by cold shrinking the edges, to get what you have on your roof---fairly flat top and somewhat like the roof contour on the sides. Then at about the 5 minute time he starts stretching that side contour to raise the roof, but think about it, is he raising the roof, or is he pulling the sides in?

The difference in this example and your roof is that your roof sides can't come in, the middle of the roof has to also stretch in order to move up.
 
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