have you had a look at the tools roofing guys use to flange long run roof sheets?
Need help putting flange on steel panels-beading-flanging-machines-159174-l.jpg
Beading and flanging machines
this would be an expensive thing to buy but I am sure that it would be simple enough to build...without the computer controlled part. at 27 feet in length I would imagine a power feed will be necessary also.