I think you could shift the top but you would have to angle the B Posts forward like the C post. That would make the front of the back door look a bit strange I think. You could also shift the top but would have to cut out above the rear door and back window before the shift and then join that section back up to the top. This would allow you to keep the B pillars straight. Hard to get the top and the sides to line up again. Either way I think it would be more work than just lengthening the top.
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