@yteaot. I was sort of suggesting that it was impossible on this shot other than maybe adjusting each image visually and then trying to form them into a panorama.
This link may help explain why it can’t correct for perspective but can link images up.
http://hugin.sourceforge.net/tutorials/multi-row/en.shtml
It links to the same link as i have already posted for perspective correction. That involves the need what should be for vertical and horizontal lines.
John