Need help putting flange on steel panels

I have a number of .29 gauge steel panels, the longest being 27' . The panels are 39" wide.

I would like to form an offset flange on one long side of each panel, so that when laid over another it is a flush fit.
I am thinking of some type of hand help roll former. Maybe 18" long with a pair of offset bead roller dies to form the flange, and a pair of small guide/stabilizer wheels on each outboard end. A small hand crank would be sufficient to turn the dies.

I hate to try and reinvent the wheel so thought I would ask the great minds here if they had already seem or used or built such a device.

Any ideas or suggestions will be appreciated.

Thanks, the Old Fool.

have you had a look at the tools roofing guys use to flange long run roof sheets?
Attachment 1311
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.